Powdery mildew on cucumbers: control measures. First aid for cucumbers: powdery mildew. Folk methods of struggle

Every beginner and experienced gardener must have planted at least a couple of such tasty and healthy vegetables, How . The vegetable contains many vitamins B and C, as well as a sufficient amount of minerals such as calcium, phosphorus, potassium, iron and magnesium. Cucumbers are an integral part of our diet in raw, salted and pickled form. Growing them is quite simple, but you need to be prepared for unpleasant surprises, namely, the plant is susceptible to such a common disease as downy mildew.

What is dangerous and where does it come from?

Downy mildew – fungal disease, which affects the foliage and stems of the plant. Downy mildew can destroy a plant in as soon as possible or significantly reduce its yield.
The best environment for harmful spores is moisture, which is why plants most often begin to get sick after rain or excessive moisture. Air temperature also plays an important role: if at night after rain the thermometer drops below 9 degrees Celsius, plants automatically fall into the risk group, since it is in such weather that numerous species of pseudofungi from the Peronosporaceae family progress.

Another cause of downy mildew may be too alkaline. Fungal diseases are characterized by increased winter hardiness and are able to maintain their viability in soil and seeds for up to 6 years.

Signs of appearance

You will immediately understand that the plant is sick: yellow or brown spots will appear on the upper part of the foliage. Soon the lower part of the leaf is also affected, which becomes covered with a purple-gray coating. progresses incredibly quickly, the leaves turn yellow and dry out. After 4-5 days, only stems may remain from the plant. Naturally, this contributes bad ovary or slower fruit growth. Cucumbers affected by fungus lose taste qualities.

Important! The disease spreads very quickly and can damage other crops–In this it is helped by pests that can spread spores, for example, aphids and whiteflies.

Most often, the disease affects plants in the phase of fruit formation or ripening; it all depends on the time of planting. In this case, harmful spores can calmly remain in the soil, and the disease will be initiated under conditions that are comfortable for them. It is believed that the fungus can cause the most harm.

Prevention

First of all, preference should be given to those resistant to the disease. You also need to be careful about sowing: before planting, the seeds must be treated, for example, in a solution of potassium permanganate. It is better to plant early varieties to prevent downy mildew spores from developing before the harvest ripens.
Experts do not recommend planting cucumbers in the same place every year - change the location of the beds every season, and this will reduce the risk of infection. When finished, cut off the stems and leaves and burn them. If the crop is grown in greenhouse conditions, then, in addition to removing plant residues, it is necessary to remove upper layer

soil and disinfect.

Agrotechnical control methods First of all, location plays a role. You should avoid areas that are too wet and adjacent to buildings in places where water may accumulate or drops may fall from the roof. You need to make it a rule to treat the seeds before planting. One of the effective methods is the processing of planting material hot water
(50-55°C). The seeds are soaked for 10-15 minutes, after which you can start planting. Plants should not be over-watered; watering should be timely but moderate. Should not be neglected regular feeding

Important! : If cucumbers receive enough nutrients, the risk of peronosporosis is significantly reduced. Preventive spraying of young plants, which are widely represented on the market, is encouraged.

When growing cucumbers in a greenhouse, it is necessary to constantly control the humidity in the room. As soon as spots appear on the foliage, you should quickly remove it so that no petioles remain.

Step-by-step implementation of preventive measures does not guarantee 100%, but significantly reduces the chances of contracting fungal diseases.

Active struggle
If it was not possible to prevent peronosporosis of cucumbers, treatment should be started immediately. The method of control depends on the severity of the disease and your preferences.

In order to defeat the fungus, first of all it is necessary to remove its foci - parts of the plant that are already damaged, and immediately burn them. After this, you can begin therapy.

The most effective chemicals in the fight against downy mildew are considered. These substances are used both to combat fungus and to treat seeds. At the early stage of plant disease, 0.5% solutions are used, "Kurzata" and.

Spray both the affected plant and the soil around it. Such preparations for downy mildew on cucumbers should be used with caution, not forgetting their high toxicity and the danger of such control measures for people and animals.

Did you know? The spines on cucumber fruits are needed to get rid of excess moisture.

Folk remedies

If you prefer safer traditional methods of fighting fungus, then there are an incredible number of different methods for this case. It is believed that regular soda very effective against downy mildew on cucumbers.

For cooking medicinal solution you will need 30 g of soda, 5 liters hot water and 5-10 ml of liquid soap. The ingredients are thoroughly mixed until completely dissolved, then the mixture is allowed to cool. After this, you should spray the soil and plants. In order to defeat the fungus, at least 3 such procedures will be required. Two sprayings are carried out in a row, and the third is carried out after 7 days to consolidate the result.

To treat plants, a mixture of iodine and milk is used. To do this, 10-12 drops of iodine need to be dissolved in one liter of milk (fat content does not matter) and diluted with 10 liters of water. Then use a spray bottle to spray the plants. Capable of defeating harmful fungi and weak solutions. 1-2 g of the substance is dissolved in 10 liters of water and sprayed on the plants.

You can also fight downy mildew using ash: it is dissolved with boiling water. Take 2 tbsp. substances per 3 liters of water. The resulting mixture is allowed to infuse, and then filtered and sprayed on the plants and soil.

Vegetables, like people, are susceptible to various diseases that affect their development and growth. The cucumber, beloved by gardeners, is also not completely immune from death. Prevention is a good thing, but sometimes vegetable diseases can become more active due to low temperatures or dampness. It is necessary to know how to save the harvest as soon as possible.

Diseases and pests of cucumbers

Vegetable crops are susceptible to various types of ailments, regardless of where they grow. Diseases of cucumbers occur in greenhouses and outdoors. The role of pathogens is usually played by fungi, but viral and bacterial lesions of plants and fruits are often encountered. Among the mushrooms there are:

• Various kinds rotten. An equipped greenhouse or growing cucumbers using ordinary film only helps the fungi in the soil to actively destroy the crops. Both the roots of young cucumbers and parts of the grown plant can rot.
• Diseases whose symptoms are spots on leaves and fruits. Based on the color of the plaque, it is not difficult to determine which disease infection has occurred, including powdery mildew. Such diseases develop well under conditions of high humidity and threaten to weaken seedlings, including the death of less resistant ones.

Cucumbers can become infected with bacteria due to angular leaf spot. The simple name hides the possibility of losing half the harvest. During the course of the disease, all parts of the cucumbers may be affected by dark brown angular spots. The leaves die first, the fruits, on the surface of which these symptoms are noticeable, become distorted and rot along with the seeds a little later.

A disease with a pleasant name - mosaic - is of a viral nature. Outwardly, it fully corresponds to its name, and its abilities make it possible to deprive gardeners of about half of the seedlings of almost any crop. Photosynthesis in the affected leaf blades is reduced, and cucumbers stop growing. Help for viruses with their atrocities is provided by low air temperature, which middle lane may occur in summer.

The small pleasant water droplets that form on the grass in the morning have little in common with the cucumber disease, although they have a similar name. White spots on the leaves of cucumbers can be considered signs of powdery mildew. The causative agent of the disease is a fungus; after the time required for the spores to mature, a certain amount of liquid can be seen on the gray-white spots. In rare cases, powdery mildew can affect the stalks and the fruits themselves.

In order not to grieve over a crop destroyed by powdery mildew, which was planted and fertilized with such difficulty, it is necessary to actively combat the pest. Sometimes everything can be limited only to preventive measures, but if it was not possible to avoid the disease, then it is necessary to treat the affected vegetable crops, preventing infection of healthy ones. There are several options for how to get rid of powdery mildew; each has both supporters and opponents.

Chemicals for powdery mildew

Store products, aimed at a specific pest, in this case a fungus, almost always completely cope with their task. However, since the composition contains chemicals, it is necessary to use preparations to combat powdery mildew according to the instructions. Funds of this type are divided into two categories:

• Fungicides. Preparations for powdery mildew, produced in the form of powders, and sometimes immediately in the form of aerosols, require spraying the diseased plant. Popular drugs in this category are Topaz and Thiovit Jet. In what proportions to dilute the powder or emulsion is clear from the description on the pack, but the product can only be used during the growing season.
• Biofungicides. A remedy for powdery mildew on cucumbers of this type will only help at the initial stage. Bacterial cultures from their composition stop the proliferation of harmful fungi. A huge advantage of such preparations for powdery mildew is their environmental safety, allowing use not only during the growing season, but also during the appearance of fruit. Among the well-known ones are Fitosporin and Planriz.

Treatment of cucumbers against diseases with folk remedies

Homemade medicines made from available ingredients are considered less dangerous due to the absence of chemicals. They are often just as effective as store-bought options. Here are some effective folk methods:

• The grated soap is mixed with iodine and milk. Per liter of milk component you will need approximately 20 g of soap and 25 drops of iodine. Cucumbers are treated with the resulting solution once every week and a half.
• The whey is diluted with water in proportions of 1 to 10. It is very important to achieve uniformity of the solution, then pour it into a vessel with a spray bottle and process the cucumbers.
• Weeds can also serve well: chop them finely, pour hot water in a 1:1 ratio, leave for 3 days. After time, strain and sprinkle on vegetables in the evenings.
• Mix 4 g of soda and grated soap in a liter of water. Achieve a homogeneous solution. Spray weekly twice daily.

Prevention methods

Regardless of whether vegetables are grown inside a greenhouse or not, powdery mildew on cucumbers can appear in all its glory. Preventive measures aimed at protecting crops can protect the future harvest from destruction. To avoid having to treat cucumbers during the growing season or fruit ripening, you need to remember following rules:

• Before placing young seedlings in the soil, make sure that there are no particles of plant origin left inside. The fact is that the plants remaining after harvesting are ideal for overwintering the mushroom. They must be removed and burned.
• Fertilizers are good in moderation! Those that contain nitrogen components in large quantities, can cause harm instead of benefit: help powdery mildew become more active.
• The causative agent of powdery mildew on cucumbers is sensitive to potassium and phosphorus. Feed cucumbers with fertilizers containing these elements.

Video: cucumber diseases and their treatment

To begin active measures to combat powdery mildew, you need to identify the disease in time by external symptoms. The photos and videos presented below will help give a complete picture of what cucumber disease looks like. Often this disease can be mistaken for peronosporosis of cucumbers, commonly referred to as downy mildew. Experts in this field will tell you how to distinguish one from the other and how treatment will differ.

Downy mildew on cucumbers - control measures

Powdery mildew of cucumbers

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Treatment of cucumbers for powdery mildew

Powdery mildew disease causes a lot of trouble for owners of gardens and vegetable plots. This disease affects both vegetable crops and fruit trees and shrubs. It is not easy to prevent its appearance; it is even more difficult to get rid of it in order to save infected plants. But before using any preparations for powdery mildew, you need to make sure that it is the cause of the problems that have arisen.

Signs of powdery mildew

The calling card of powdery mildew is whitish- gray plaque. Thin and dust-like at the beginning, it gradually begins to thicken and turn black over time. Small brown balls form on the upper side of the leaves. Diseased leaves dry out, shoots bend at the ends, darken and die.

Whitish powdery spots may appear on the leaves of roses, grapes or cucumbers. At the first stage, even before plaque forms, the infected leaves become dull, lose their elasticity or slightly wrinkle.

Most often, the infection begins its destructive effect from those leaves and shoots that are located near the ground. Gradually it rises higher and captures the entire plant, including petioles and stalks. Infected fruits usually crack and rot.

Causes of powdery mildew

In order to find effective remedies for powdery mildew, you need to clearly understand where and why it occurs.

Spores of the fungus that causes powdery mildew disease live in the soil. They are almost always present there. But they begin to manifest themselves only under certain conditions. So, in sunny, warm weather, with sufficient watering and optimal nutrition, plants rarely become infected with this fungus. But as soon as the ambient temperature drops to 12 - 15 °C and remains there for about a week, an alarming white coating begins to appear on the leaves.

Gardeners have long noticed that not all plants get sick. Even pampered cucumbers in a greenhouse can remain intact if they are not overfed with nitrogen and are not too exhausted high humidity. The fungus does not settle even where fertilizing was applied in time and thinning was carried out.

What factors contribute to powdery mildew infection? As practice shows, this is:

Cool, cloudy and damp weather when air humidity exceeds 80%; - presence of excess nitrogen in the soil; - highly dense plantings; - the soil often gets too dry and then flooded;

Watering is done when the top layer of soil is still moist.

Fungal spores awakened in this way can be transmitted to other plants. They are easily transported through the air, along with water, even through the hands of a person who has touched an infected leaf or branch.

Prevention of powdery mildew

Like most other plant diseases, powdery mildew is easier to prevent than to cure. Therefore, prevention is the first remedy against such a fungus. And any prevention is, first of all, correct agricultural technology. To minimize the risk of infection you should:

Regularly thin out plantings; - remove old leaves in contact with the ground; - water the plants only after the top layer of soil is completely dry; - do not abuse nitrogen fertilizers;

Conduct phosphorus-potassium fertilizing in a timely manner.

Another type of prevention against powdery mildew can be carried out in early spring, before the leaves bloom. Berry bushes and other perennials are simply scalded with boiling water. This must be done quickly, using a watering can with a diffuser. You should pour over all the branches as a whole, without lingering long in one place.

A short-term exposure to very hot water does not have time to harm plants that have not yet fully awakened after winter. But spores, mycelium, like pathogens of other diseases, die. A jet of steam under pressure produced using a household steam cleaner has a similar effect.

Treatment for powdery mildew

To successfully combat powdery mildew, it is necessary to destroy not only the mycelium, but also the spores of the fungus. At the first signs of the disease, you should:

Completely eliminate any spraying; - refuse to fertilize those beds where affected specimens are noticed; - if possible, improve the illumination of plants; - thin out the plantings and remove all weak and old leaves, cut off flower stalks; - if the plant is in a pot or container, it is advisable to replace the soil in its upper part; - water or douse using one or another remedy for powdery mildew;

Treat not only the leaves, but also all shoots and stems with the medicinal preparation; Potted plants can simply be dipped into a basin, tub, or other container filled with the solution.

For treatment, you can use proven folk remedies, or purchase ready-made chemicals.

Folk remedies for powdery mildew

1. Soap and soda solution:

Soda ash - 25 grams; - liquid soap - 5 grams;

Hot water - 5 liters.

Dissolve soda in water while adding soap. After cooling, the plants and the adjacent top layer of soil are sprayed. This should be done at least twice, with an interval of 7 - 10 days.

Another variant:

Baking soda - 1 tablespoon; - liquid soap - 0.5 teaspoon;

Water - 4 liters.

All parts are mixed well and the plants are sprayed 3 times at intervals of no more than a week.

2. Whey solution:

Serum - 1 part; - water - 10 parts.

The plants are treated 3 times at three-day intervals, so that a film forms on the leaves, preventing the mycelium from breathing. The product is effective only in dry weather.

3. Horsetail decoction:

Fresh horsetail herb - 100 grams; - water - 1 liter.

The horsetail is filled with water and kept for a day. Then boil on fire for two hours. Then cool and filter. The resulting concentrate can be stored in a cool and dark place for about a week. Before spraying, the product is diluted with water in a ratio of 1:5. Treatment is carried out three to four times every five days.

4. Solution of copper sulfate with soap:

Copper sulfate - 5 grams; - soap - 50 grams;

Water - 5 liters.

Soap is dissolved in warm water. Separately dilute the vitriol using a glass of hot water. The vitriol solution is carefully combined with soap, pouring in a thin stream and stirring constantly. The resulting emulsion is applied to the affected plants several times at weekly intervals.

5. Mustard solution:

Mustard powder - 2 tablespoons; - water - 10 liters.

Mustard is stirred in warm water. After cooling, you can either spray or simply water the plants.

6. Soap solution with ash:

Ash - 1 kilogram; - water - 1 bucket.

The water is heated to approximately 40 °C and the ash is poured over it. The solution is thoroughly mixed and infused for about a week. After this, it is drained, separating and removing the ash suspension that has collected at the bottom. Before spraying, add a little soap to the solution. It is necessary to process every other day or daily.

7. Infusion of rotted cow dung;

Rotted manure - 1 part; - water - 3 parts.

The manure is poured with cold water and left to infuse for at least three days. Before spraying, dilute with water twice.

8. Garlic infusion:

Garlic - 50 grams; - water - 2 liters.

The garlic is crushed and dipped in cold water. After standing for 24 hours, drain and filter. The solution is used undiluted for spraying.

9. Copper sulfate and soda ash:

Copper sulfate - 80 grams; - water - 10 liters; - soda ash - 50 grams;

Water - 10 liters.

In the spring, even before the buds open, they are sprayed with a solution of vitriol, and after flowering is finished - with soda ash.

10. Colloidal sulfur solution:

Sulfur - 40 grams; - water - 10 liters.

The product is well suited for spraying currants during periods of their growth. But we must remember that it cannot be used for gooseberries.

Special chemicals for powdery mildew

"Topaz" is a popular systemic fungicide used for the treatment and prevention of fungal diseases. The active ingredient is penconazole. To spray currants, gooseberries, grapes, cucumbers and strawberries, one ampoule is diluted in 10 liters of water. For flowers and potted crops- 5 liters. Spray only with freshly prepared solution, evenly wetting the entire plant. The treatment is repeated after about two weeks. The protective effect lasts up to 14 days. The drug belongs to the third hazard class - toxic to fish, but not dangerous to beneficial insects and birds. It is considered moderately dangerous to animals and humans.

"Tilt CE" is a systemic fungicide. Used as a preventative and protective agent. The active ingredient is propiconazole. Available in the form of an emulsion concentrate. It has a long duration of action, stops further development of the disease, and suppresses the formation of fungal spores. Fever air has a beneficial effect on the work of the drug, enhancing its effectiveness. "Tilt CE" has high rain resistance, as it penetrates very quickly into plant tissue.

A working solution, with a concentration of 0.4 to 0.5 ml per liter of water, must be prepared immediately before use. It is not recommended for use at air temperatures exceeding 29 °C, accompanied by humidity less than 60%. The protective effect exceeds half a month and begins to appear within two hours after the end of treatment. Dangerous for fish and bees.

To combat the spread of powdery mildew, the following drugs are also used: Bayleton, Sulfarid, Fundazol, Previkur, Acrobat MC, Skor, Vitaros and others.

Diseases of cucumbers in a greenhouse

Cucumbers are a heat-loving crop that requires proper care, nutrition, formation, watering and fertilization. Cucumbers also need protection from pests, diseases and weeds.

All the most common diseases are infectious.

Diseases and factors of their occurrence

Diseases to which cucumbers are susceptible in a greenhouse are associated with the following factors:

• improper conditions for caring for cucumbers in the greenhouse;
• long time soil is used;
• incorrect selection of crops, neighbors and predecessors;
• creation of an artificial microclimate;
• inability to grow cucumbers;
• drought;
• flaw nutrients, minerals and fertilizers;
• too much watering.

The most common cucumber pests are melon aphids, spider mites, and sprout flies.

The most common diseases of cucumbers are:

• basal and root rots;
• gray and white rot;
• withering;
• powdery mildew;
• ascochyta;
• bacteriosis;
• downy mildew;
• olive spot;
• brown spot;
• anthracnose;
• Alternaria blight;
• black mold.

These are the most common diseases of cucumbers in the greenhouse, but, in general, there are many more of them. All of the above diseases are infectious. That is, they are transmitted from plant to plant. In this regard, it is necessary to take measures for disinfection and combat the spread of infection. Cucumber pests most commonly found in greenhouses:

• melon aphid;
• spider mite;
• sprout fly.

Useful tips for growing cucumbers in a greenhouse

1. Under no circumstances should cucumbers be planted in soil where zucchini, pumpkin and cucumbers grew.
2. Planting cucumbers should be alternated. The best predecessors for cucumbers should be: potatoes, beans and tomatoes.
3. You can plant cucumbers in a place where they have already grown before no earlier than 3 years.
4. You only need to water the cucumbers warm water and only at the root.
5. Cucumbers should be staked otherwise they may face many fungal infections.
6. Before planting vegetables in a greenhouse, you need to prepare the soil for planting and the greenhouse premises. It must correspond to the correct temperature conditions in summer and winter, at night and during the day.

Adhering to such simple rules, you can avoid many problems when growing cucumbers. To fight infectious diseases of vegetables, you need to know what signs a particular disease shows. You need to become familiar with all the typical diseases, then it will be easier to treat plants. Every disease is treated different ways, the principle of treating cucumbers is the same as in humans, you cannot treat everything with one remedy. It is better to understand the cause and deeply study the disease, how it manifests itself and what it threatens. And only then treat. It happens that gardeners can treat cucumbers at random with some kind of solution, but the disease will not go away. It turns out that the waste of time and money will go to waste. In order for there to be a result, you need to have complete information. Skill comes with experience. Before planting cucumbers, novice gardeners, especially, need to study the characteristics of diseases and pests in order to protect and save the future harvest.

Basal and root rots

The reasons for the appearance of white rot: high air humidity in the greenhouse, a poorly ventilated greenhouse and a large planting of vegetables.

a brief description of and signs of disease in cucumbers in greenhouses. The roots and stems at the roots become brown, become spotted, dry out, the leaves also become stained and fall to the ground. The roots may split, darken and dry out. As a result, the plant is stunted in growth and dies. Source of the disease The causative agent of the infection is pathogenic fungi that live in the soil. They can even be stored in seeds, and when planted they begin to appear. Fungi infect both young plants and adults. Causes of the disease Infection can occur with a sharp change in temperature. If you water cucumbers with cold or hot water, the risk of infecting the plant increases.

Gray and white rot

White rot.

Its signs:

If the stem gets wet and is covered with a white coating like cotton wool, then it is white rot. It affects the stem and tops at branching points. The causative agent of the disease is a polyphagous fungus. It affects not only cucumbers, but also many other vegetables. Causes of the disease: high air humidity in the greenhouse, a poorly ventilated greenhouse and a large planting of vegetables lead to infection of cucumbers with white rot.

Gray rot.

Signs:

To combat gray rot in cucumbers, you need to sprinkle the affected areas of the plants with chalk and moisten them with a solution of copper sulfate (0.5%).

Spots that look like wet spots appear on the stem, fruits, flowers and leaves. A gray coating and black spots appear. The causative agent is the fungus Botrytis cinerea. Causes of the disease: gray rot, like white rot, appears due to poor ventilation and high humidity in the greenhouse. Bacteria live on the greenhouse structure and in the soil.

Sprinkle the affected areas of the plants with chalk and moisten them with a solution of copper sulfate (0.5%). The soil infected with rot is selected and cucumbers are not allowed to be planted in this place for 2 years.

Wilting of plants

Signs:

To combat wilting, loosening the soil under the plants and timely watering is required.

The leaves become limp and the plant falls to the ground. The stems turn white and have a pink or white coating on them.

• pathogens are pathogenic fungi that penetrate the plant through the root;
• The cause of infection is soil that is too dense and not loosened. Roots in hard soil grow and develop poorly, water does not reach them, and therefore the plant’s growth is inhibited, the fruits become small and not tasty.

Control: loosening the soil under the plants and timely watering is required to avoid wilting.

Powdery mildew on cucumbers

Pathogens infect plant leaves. The leaves are covered with a gray-pink coating. Then black dots appear on the leaves, the surface of the leaf withers and dries, and the plant dies. The source of bacteria is introduced from open ground.

Sources of infection are located near the doors, windows of the greenhouse and heating pipes.

The cause of this disease is draft and sudden temperature changes.

1. If signs of plaque appear, plants are treated with a solution of potassium permanganate (2 g per 12 liters of water).
2. 250 g of onion peel is poured into 12 liters of hot water, infused for 1.5 days, filtered, and then the plants are treated with the infusion.

Ascochyta blight

Signs:

Wet spots, black spots, and watery spots form in the root part of the plant, which cause the plants to dry out. The leaves first turn yellow, then dry out, and then the whole plant dies. The infection is transmitted through water, drops and air currents. Air humidity and weakening of plants leads to bacteria multiplying better.

Plant residues are removed. If it is possible to preserve the cucumber, then the plant is sprayed with a composition consisting of water, figon - 0.2%, zineb - 0.6%.

Bacteriosis

The fight against cucumber bacteriosis consists of spraying with Bordeaux mixture (1%) or using copper oxychloride (0.60%), zineba (0.60%).

The disease manifests itself as follows: black spots appear on the corners of the leaves. The corners dry out, and soon the entire sheet becomes damaged, covered in spots, sores and holes. The plant begins to look as if birds were pecking at it. The infection spreads through drops of water. A good environment for the propagation of bacteriosis is an air temperature from +16 to +20 degrees.

Control: plants are sprayed with Bordeaux mixture (1%) or copper oxychloride (0.60%), zineb (0.60%) is used.

Downy mildew

The disease manifests itself as white round and angular spots on the leaves. A gray coating may appear on the stem and foliage. Diseased leaves become brittle and curl. If the infection is severe, the plant dies. The infection is transmitted by droplets at high air humidity and a temperature of +20 degrees.

1. Mix skim milk (1 l) with 8 l of water and add 10 drops of iodine 5%.
2. Ash (0.5 l) brews 2.5 l boiled water, infuse for 30 minutes, add more water to 8 liters.

In the first and second variations, the plants must be sprayed with the resulting consistency.

Olive (brown) spot

Most often, this disease affects cucumber fruits and develops in greenhouses that are covered with film material. Bacteria live on the structures of cultivation equipment and structures. Spotting appears on fruits in the form of spots, olive color and then the spots develop into ulcers. The plant stops growing.

Fight: the greenhouse is fumigated for 2 days using sulfur dioxide (sulfur bombs), both equipment and everything where plaque is present are thoroughly cleaned. You can repeat if necessary.

Anthracnose

The disease is also called copperhead.

To get rid of anthracnose, cucumbers are sprayed with Bordeaux mixture (1.5%) or a 1% suspension of colloidal sulfur.

Appears on leaves, but also occurs on stems. Signs are spots with plaque, which then crumble the leaves. The spots may be single or numerous. Then the leaf turns black and falls off. The bacteria are transmitted through the air and by droplets. They can remain in seeds and plant debris in the ground or on the surface.

Control: all plant residues are removed, sprayed with Bordeaux mixture (1.5%) or a 1% suspension of colloidal sulfur.

Black mold

It is characterized by the formation of small spots, at first barely noticeable with black dots. Then the spots increase in size. Conditions for reproduction are high humidity. The disease leads to the death of the leaf and the death of the plant as a whole.

Fight: try to plant cucumbers in a drier place in the garden. It is better to water more often than to be left without a harvest.

Pests of cucumbers in greenhouses

melon aphid

Pests in the greenhouse - aphids, sitting on inside leaves, stems and flowers. After damaging a plant, aphids cause it to curl up and the leaves fall off. Aphids transmit diseases throughout all plants, thereby infecting the entire greenhouse. Once a plant is damaged, it slows down and dies.

Aphids and a means to combat them: treatment with a solution of laundry soap and lye, or you can take wood ash and soap. 100 g soap, 200 g lye, 200 g wood ash and 10 liters of water.

Spider mite

Fight against mites: the plant must be treated with water, sprayed with a solution of water mixed with garlic. Weeds also need to be removed.

Pests of cucumbers in greenhouse conditions are mites that sit on leaves and stems. After a leaf is bitten by a mite, it turns yellow, dries out and dies.

Fight against mites: the plant must be treated with water, sprayed with a solution of water mixed with garlic. You also need to remove weeds and dig up the soil well in the fall.

growth fly

The fly is also a pest in the greenhouse. She lays eggs in the soil. When cucumbers sprout, the fly harms them the most. It feeds on the nectar of flowers, lays larvae and has three stages: egg, pupa and adult insect. After cucumber sprouts become infected, they acquire a bluish color and soon die.

Fly control: treatment with chemical solutions. They need to be sprayed on young shoots.

Disease and pest control

• when growing cucumbers in closed ground you need to adhere to the correct temperature +18 at night and not higher than +26 during the day;
• Sudden changes in temperature should not be allowed;
• ventilate the room well;
• if plants are damaged, they are removed, leaving only whole, undamaged ones;
• draft is an enemy for vegetables in a greenhouse. It must not be allowed;
• use fertilizers organic substances;
• to protect the plants you need to treat the entire area of ​​the greenhouse chemical fertilizers;
• Before planting, you need to prepare and cultivate the soil. Fertilizers need to be applied in advance, in the fall. Repeat the process in the spring;

In greenhouse conditions, vegetables are at risk of contracting diseases in the same way as in open ground.

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Plant diseases: powdery mildew and downy mildew

The development of plants and the appearance of crops are often hampered not only by insect pests, but also various diseases: powdery mildew, downy mildew, black rot, coccomitosis, anthracnose, rust and many other fungal diseases.

In this article we will talk about how to deal with powdery mildew and the treatment of downy mildew (perenospora).

Powdery mildew- This is one of the most common fungal diseases affecting pumpkin crops. It is usually found in greenhouses and greenhouses, but under favorable weather conditions (high air temperature and humidity) it quickly spreads in open ground.

Peronosporosis affects cucumbers, melon, pumpkin, watermelon, as well as plants of the goosefoot family. More often than other plants, parsley, parsnips, celery, dill, as well as cucumbers, zucchini, cabbage, peas, onions, and beets are infected with this disease.

Measures to combat powdery mildew and its photos

As you can see in the photo, powdery mildew is a white coating on the leaves and causes plants to dry out. With severe damage, white spots also appear on the stem and fruit.

The rapid spread of powdery mildew in protected soil conditions is facilitated by sharp temperature fluctuations, drafts, and watering plants with cold water. In open ground, powdery mildew spreads quickly with the onset of persistent hot weather and the appearance of dew.

The causative agents of the disease persist on plant debris and weeds.

In open ground, it is recommended to grow varieties resistant to powdery mildew. Plant residues, as well as diseased plants, should be burned or buried in the soil to a depth of at least 40 cm. In the fall, the soil must be carefully dug up and crop rotation must be observed, that is, plants should be planted in their original place no earlier than after 3 years.

One of the measures to combat powdery mildew is to lubricate the leaves and stems with ground or colloidal sulfur using a cotton swab. Further, if necessary, plants should be treated with a suspension of colloidal sulfur or mullein infusion.

To prevent the disease, the temperature regime should be observed. The daytime temperature in the greenhouse should be 24-26 °C during the day, and 20 °C at night.

This fungal disease affects the leaves and stems of beans and peas, which turn yellow and dry out. At the same time, a powdery coating consisting of fungal spores is clearly visible on the affected organs. The disease can persist for a long time on plant debris. The development of infection occurs at an air temperature of 20-25 ° C and a relative air humidity of 70-80%. To protect legumes from powdery mildew, sources of infection should be destroyed and preventive actions, which include treating plants with sulfur preparations 2-3 times every 10-15 days.

How to deal with downy mildew and photos of downy mildew

Downy mildew affects plant leaves. It develops both indoors and outdoors and often leads to the death of plants.

Pay attention to the photo of downy mildew - at first these are oily spots on the leaves, which then turn brown. The purple coating of fungal spores is clearly visible on the underside. The pathogen can persist in soil and plant debris for 5-6 years. There are no varieties resistant to the disease.

The spread of peronosporosis is facilitated by high humidity and air temperature, therefore, to protect plants in protected soil, an optimal microclimate should be maintained. Air humidity should be no higher than 80%, and the air temperature at night should not be lower than 20-22 °C. Downy mildew can persist in the soil and on plant debris, so you should dig up the soil in the fall and burn the plant debris.

For guard pumpkin crops against peronosporosis they are sprayed with a 0.4% solution of copper oxychloride, a 0.4% solution of polycarbacin or Bordeaux mixture. To prepare it, mix 100 g of lime and 100 g of copper sulfate with 10 liters of water. Before planting in open ground, it is recommended to feed the seedlings with ammonium nitrate.

When growing crops in greenhouses, it is important to avoid sudden temperature changes.

High air humidity is also harmful to plants under the film.

Photo gallery: powdery mildew and downy mildew (click to enlarge):

Powdery mildew on cucumbers

Signs of powdery mildew on cucumbers (see photo) are small brown spots covered with a white coating (also called mycelium). First affected small area, but over time the disease covers the entire leaf. It gradually becomes dull and dries out completely. Cucumber seedlings affected by this disease do not develop, and the formed young shoots no longer grow.

How to fight powdery mildew on cucumbers? Protection is carried out by preparing a solution of weeds. For this you need next material: plantain, coltsfoot, nettle, dandelion, wood lice, fireweed. All plants are crushed, placed in a bucket (usually the capacity is 10 liters) and filled with hot water. Next, add one teaspoon of urea, manganese powder, liquid soap and mix everything. And if the question arises - how to treat cucumbers against powdery mildew and other diseases, then the resulting solution is the best option for plant protection.

In addition to a natural herbal cocktail for powdery mildew on cucumbers, folk remedies- whey and a mixture of mullein and urea in a proportion of 10 l. water/1 kg cow dung with 1 tbsp. spoons of urea.

To prevent powdery mildew on cucumbers, use fine sulfur powder (the soil is pollinated through three-layer gauze and covered with film for 3 hours). Also, when fighting powdery mildew on cucumbers, use a decoction of horsetail.

Preparation of tincture: 100 gr. dried or 1 kg of fresh horsetail is infused for about a day in 10 liters of water, then boiled for about 2 hours. After boiling, the broth should be cooled and diluted with water in a ratio of 1:5.

In this way, the process of growing cucumbers can be significantly improved. Diseases are eradicated, and the soil becomes quite suitable for safe growth and fruiting of plants.

Advice! To prevent disease, diseased leaves and shoots should be burned immediately. Throwing them on the edge of the garden or bed is not recommended.

How to deal with downy mildew (peronospora)?

The main sign of downy mildew on cucumbers (see photo) are yellow-green spots that cover most of the leaf. They are also mistaken for traces of acid rain. A purple-gray coating appears at the bottom of the leaf, as a result of which it dries out completely and crumbles. Downy mildew of cucumbers affects plants regardless of age. It is typical in most cases when growing cucumbers in open ground.

The prerequisites for the occurrence and development of peronosporosis are high humidity and air temperature up to 16-180C. The disease develops from small droplets on a leaf.

Spores are able to maintain their dangerous vital activity in the soil for a long time, so it is very difficult to fight them. If peronosporosis or downy mildew appears on cucumbers, then control measures should include the use of certain preparations containing copper (Bordeaux mixture, Ridomil Gold, Oxychom). These products are effective as a prophylactic agent.

If cucumbers are affected by downy mildew, then treatment is carried out with the drug “Rizoplan”. It is based on living cells of certain bacteria. They are absolutely harmless to humans, but are destructive to downy mildew spores. The drug also does not accumulate in the soil, but decomposes immediately.

In addition to traditional preparations, you can also use a folk remedy for downy mildew on cucumbers - whey. The leaves are sprayed with it.

How does olive spot (cladosporiosis) appear on cucumbers?

The occurrence of olive spotting on cucumbers (see photo) should be observed in the second half of summer, when the cucumbers have already fully formed the bush. Olive spot appears on fruits in the form of olive (brown) spots with a coating. The disease spreads quickly and if left untreated, the entire crop can be lost.

This type of disease is more typical for greenhouse conditions. Cladosporiosis spores are resistant to the greenhouse microclimate, so control of this disease should be started immediately.

If olive spotting of cucumbers is observed, then control measures should include thoroughly wiping all surfaces of the greenhouse with a disinfectant that does not contain chlorine. Under no circumstances should you water cucumbers with cold water, and when the disease is first detected, you should stop watering the plant altogether for 3-4 days.

Treatment of cucumber disease in open ground is carried out by using solutions that contain copper - Bordeaux mixture with the addition of liquid soap.

In order to prevent the appearance of olive spot, crops should be changed in the affected areas.

What is the common cucumber field mosaic?

Common cucumber mosaic (see photo) most often develops in open ground. Signs of the disease are yellow-green spots in the form of a mosaic. As the disease progresses, the leaves of cucumbers curl, become dull, dry out and fall off. The fruits become very pimply. Under the influence of the disease, the plant’s immunity weakens so much that when the air temperature sharply drops, the bush simply stops growing and soon dies.

The danger of this disease lies in its resistance to cold. Spores of the common field mosaic easily survive winter and cold in the root systems of reserve plants (sow thistle, quinoa, woodlice, bindweed, wheatgrass). These are difficult to remove weeds, so it is very difficult to fight this virus. You can apply the method of growing cucumbers in plastic bottles. It is absolutely not complicated and plants are not affected by field mosaic in 94% of cases.

How to spray cucumbers against illness? For ordinary cucumber mosaic, treatment consists of spraying the bushes with whey. In especially severe cases, this is done with a concentrated substance, and in preventive measures and in the initial stages of the disease, the serum should be diluted with water in a ratio of 1:2. Treating cucumbers against diseases with folk remedies very often gives a positive and lasting result.

Green and white mosaic mottled

Green and white cucumber mosaic (mottled) is one of the most common infections. Signs of the disease are wrinkled leaves with blown out areas, and areas with a green or white color also appear. The spots become white as they progress. In this case, it is very difficult to fight the disease.

At an advanced stage, cucumber bushes dull their growth. The leaves weaken and begin to wither in places. The fruits, accordingly, become very soft and their taste deteriorates. An outbreak of the disease can be triggered by a sharp increase in temperature from 220C to 300C.

This dangerous viral disease is transmitted through untreated tools, plant debris, and simply persists in the soil. To combat this disease, gardeners choose varieties that are resistant to the disease (mostly hybrids for open or closed ground).

The best way to get rid of this cucumber disease is care. It is necessary to remove affected shoots and leaves in a timely manner and burn them immediately. Also, for prevention, you can spray the bushes with a light whey solution.

How to deal with gray cucumber rot?

Gray rot on cucumbers (see photo) is a type of viral disease that manifests itself during the period of active fruiting. Plaque may appear on leaves, stems and fruits gray, especially in internodes. The most favorable environment for its development is a densely planted area of ​​​​a vegetable garden or garden bed.

The fact is that cucumbers that grow in close proximity to each other begin to rot due to the inability to develop in close quarters.

How to deal with gray rot on cucumbers? The therapeutic measure is the timely removal of diseased leaves and entire sections of the stem. In some cases, it is necessary to remove the entire bush. The fight against gray rot on cucumbers also involves applying a specially prepared substance (chalk with potassium permanganate) to the wounds of the removed leaves. The consistency of such a remedy should be viscous and have a light pink tone.

Root rot of cucumbers

The danger of root rot of cucumbers (see photo) is that signs of the disease are not immediately visible, since it affects root system plants. The first sign of this disease is a sharp wilting of the bushes. In this case, you cannot start watering the plant, this will harm it even more.

How to save cucumbers from root rot? In the early stages of the disease, you should slightly expose the root system (to do this, you need to lightly loosen the soil around it). Treatment for root rot of cucumbers involves sprinkling the affected parts with a specially prepared mixture (charcoal, chalk and ash). A solution of copper sulfate and copper oxychloride can also help against root rot of cucumbers.

After treatment, the roots and part of the stem should be sprinkled with clean, dry and unaffected soil. Watering can begin at the first sign of improvement in plant growth.

glavnaya-dacha.ru

how to cure a cucumber plant from powdery mildew in protected soil?

Linda

Spray with fungicide

Nikitich

Downy mildew. The development of the disease is facilitated by increased air humidity at high temperatures. The infection persists in the soil on plant debris. It is difficult to defeat powdery mildew, but it is possible if you use the entire range of preventive and eradication agents.

First of all, this is the observance of garden crop rotation when growing cucumbers in open ground, and in closed ground, if there are two greenhouses, alternately growing cucumbers and tomatoes in them. Of no less importance is the cleaning of greenhouses and greenhouses in the fall from plant residues and weeds and their immediate destruction, followed by disinfection of the entire greenhouse with bleach or fumigation with sulfur briquettes. Deep digging of the soil in autumn is also of great importance...

Galina Kurmaeva

You can sprinkle with manganese

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A systemic drug - TOPAZ, helps 100%.

Svetik

Maybe water it with warm water at the root? I grow everything in open ground. I, too, are covered with some kind of yellowishness - like bubbles, it looks like rust... And then all the leaves even dry up. I don't know what kind of disease this is. We say that the dew is bad or there is fog. There is nothing to do - the end is coming for the cucumbers - the deadline has already passed for them. And we calm down. From this time on, the cucumber harvest is low, and then disappears altogether. Maybe I should try Topaz? I don’t know what kind of disease I have.

Rodionov Sergey

treatment is quite difficult since the use of fungicides excludes the use of fruits for food. It is much easier to prevent this disease and use varieties resistant to this disease; now the choice is quite extensive. treatment in any case will greatly reduce the yield and further maintenance of plants in the greenhouse will no longer be economically feasible. Perhaps you should think about changing the plants you grow so as not to waste time?

Olga Malysheva

I know that before intensive fruiting begins, to prevent downy mildew (downy mildew), the plant must be sprayed with a copper preparation (oxych). How about a cure? I think the affected plant should be removed in order to save the rest, stop watering, ventilate the greenhouse well, and scatter ash or chalk on the soil to dry it. The leaves can also be dusted with ash. Or spray the plant with iodine (10 ml per 10 liters of water). This helps currants and tomatoes against late blight. And Sveta, I think, has bacteriosis on her cucumbers, and needs to be sprayed with Fitosporin.

Spring Melody

Old people taught: to water cucumbers after harvesting with brilliant green solution, 10 drops per bucket of water. You can start earlier for prevention. I checked. Works.

vyrastisad.ru

Powdery mildew on cucumbers: effective methods of control

Favorable factors for the spread of the virus are warm and damp weather. 3-4 days after heavy rainfall, outbreaks of powdery mildew can already be observed on cucumbers. She prefers temperatures between 16–22 degrees and increased degree humidity. Spore formation also requires plenty of light. A decrease in the immunity of vegetable crops to pathogenic effects is facilitated by sharp changes in day and night air temperatures.

The causative agents of the virus often remain living in last year’s plant debris that overwintered on the site.

Signs

Infection of plantings with ashtray contributes certain conditions plant content:

• cool and damp weather;
• plantings thickened beyond the norm;
• high nitrogen content in the soil structure;
• excessive drying and subsequent flooding of the soil;
• watering the area at a time when the top layer of soil is still quite wet.

The hallmark of the disease is a white fluffy coating on the surface of the foliage. The first signs of damage to cucumbers by a spore-bearing fungus are round shape whitish spots or light reddish. First they can be seen on the top of the leaf, and later on the bottom. Over time, they colonize all green areas, right down to the shoots and roots. Some lashes, in case of severe damage, can dry out. The leaves become curled and have a loose surface. Plants are weakened, there is an acute lack of oxygen, which often provokes their death.

Very favorable conditions for the appearance of ashtrays exist inside the greenhouse. There, air humidity can go off scale up to 80% and there is droplet moisture. The first signs of the disease can be observed near open windows. Often the disease can be seen on the foliage of cucumbers, less often it is located on the cotyledons. The infection spreads from leaves and shoots located close to the soil surface. Fruits infected with the virus are prone to cracking and rotting.

Video “Signs of powdery mildew on greenhouse cucumbers”

See what greenhouse cucumbers look like with leaves affected by powdery mildew.

How to fight

As soon as you notice the first signs of the disease, you should take immediate action. Before starting treatment of plants, you need to exclude any types of spraying, stop fertilizing, improve the level of illumination of the plantings, thin them out and remove old and weakened leaves, and cut off flower stalks. After such manipulations, it will be possible to effectively fight not only the mycelium, but also fungal spores.

Modern gardeners and gardeners often use chemicals to combat fungal infections:

• Topaz, which is used by many to fight the virus, is a popular systemic drug whose active ingredient is penconazole. It is used for treatment at the rate of 1 ampoule of the product per 10 liters of water. Spray with the freshly prepared solution. Treatment frequency: every 2 weeks. The drug in the process of treating plantings is moderately dangerous to human and animal health.
• The product Tilt CE for treating plants with the active ingredient propiconazole is offered in convenient form emulsions. It tends to suppress the formation of spores. The effectiveness of the drug is enhanced by high ambient temperatures. The product quickly penetrates the plant tissue. A solution to combat the disease is prepared at the rate of 0.4 - 0.5 ml of the drug per 1 liter of water. The protective effect appears a few hours after treatment and lasts for more than 2 weeks. The product is dangerous for bees and fish.

Handle vegetable plantings To combat fungal infections, you can also use the drugs Sulfarid, Bayleton, Fundazol, Previkur, Skor, Vitaros, Acrobat MC. In the initial stages of the disease, it is permissible to fight the disease with sulfur-containing drugs, such as Tiovit Jet or VDG. Copper-containing ones are also effective - oxychloride, Bordeaux mixture in the proportion of 1 teaspoon per 10 liters of water.

There are quite a variety of folk methods of control, which have proven themselves well among gardeners over many years.

A soap and soda solution has always helped get rid of a fungal infection. To prepare it, take 5 grams of liquid soap, 25 grams of soda ash per 5 liters of boiling water. The plants will need to be treated several times, after a break of 7–10 days.

A solution of whey at the rate of 1 part to 10 parts of water is also used to combat the disease. Treatment is done 3 times with an interval of 3 days.

Horsetail decoction – 100 grams of horsetail per 1 liter of liquid. It's not difficult to prepare. Horsetail is filled with water and kept for 24 hours. Cools and strains. Before spraying, dilute with water in a ratio of 1:5. Plants are sprayed with it 3 times every 5 days.

Copper sulfate in an amount of 5 grams is combined with 50 grams of soap and 5 liters of water. The resulting emulsion should be used to treat the plantings at least 2 times, taking a break of 1 week.

Mustard solution will also help in treatment. To prepare it: 2 tablespoons mustard powder stir in 10 liters warm water. Next, the vegetables are watered.

Among folk ways In the fight against cucumbers, treating cucumbers with a solution of soap and ash is popular. It will require 1 kg of ash per 1 bucket of water. The solution should be infused for about 1 week. Before treatment, which will be carried out every day or every other day, add a little soap.

For help cucumber plantings A solution of rotted mullein will also come - 1 part to 3 parts water. It is infused for about 3 days. Before use, dilute with water, increasing the volume by 2 times.

Garlic infusion – 50 grams per 2 liters of water. The garlic is crushed, placed in cold water for 1 day, then filtered.

Another recipe for fighting the disease is 80 grams of copper sulfate, 50 grams of soda ash, 10 liters of water.

You can try treatment with a solution of colloidal sulfur. To prepare it you will need 40 grams of sulfur per 10 liters of liquid.

In addition to powdery mildew, there is also downy mildew, called penosporosis. It is distinguished from powdery mildew by the presence on the surface of the leaves not white, but yellow spots. Since it is even more difficult to fight with it than with ashtray, it is better to take preventive measures: you should not sow the seeds too thickly, you need to adhere to the rules of crop rotation, you should not water the crops with cold water, you need to harvest on time.

If the appearance of downy mildew cannot be avoided, measures must be taken to treat it. Such drugs as Kuprosat, Ridomil, Oxychrome will help with this. Effective against false form virus folk recipes, for example, spraying with whey in combination with copper sulfate (1 teaspoon per 3 liters of whey and 1 bucket of water).

How to warn

Experts advise growing cucumber varieties that have lasting immunity to the disease. These are Ofix, Swallow, Phoenix, Golubchik, Octopus, Pasadeno, Pasamonte.

Sanitary cleaning of the area (removal of plant debris and weeds) and adherence to crop rotation rules (returning pumpkin crops to their usual place no earlier than 3 years) are used as preventive measures. Preventive measures include isolating crops to prevent the virus from being affected by the virus at a distance of more than 20 meters from similar crops. It is also necessary to regularly thin out the plantings and remove old leaves from the cucumbers that touch the surface of the ground. It is important not to apply a lot of nitrogenous fertilizers and to feed the crops with phosphorus-potassium fertilizers in a timely manner.

There is a type of disease prevention tested by many gardeners.

Even before the leaves bloom, namely in early spring, the bushes on the site are scalded with boiling water. This is done quickly using a watering can with a diffuser.

This effect does not harm those who wake up after hibernation plants, but leads to the death of fungal infections. It is permissible to resort to the help of a household steam cleaner - a jet of steam, which is supplied under high pressure, has a similar effect.

Video “Ways to counteract powdery mildew”

In this video, an experienced gardener will tell you what needs to be done to prevent and treat one of the most common fungal diseases that affects gardens and vegetable gardens.

griadki.com

First aid for cucumbers: powdery mildew

Cucumbers. Their climbing two- and three-meter vines with large leaves, which are akin to maples, are strewn with more than a dozen treasured greens with pretty yellow flowers. With the exception of the latter, each puzzle with such a wonderful plot is presented in turquoise and light green colors. And it also happens that you have to “ring the bells.” The reason for this is powdery mildew on cucumbers. Well, she knows how to bring gray into the colorful days of a summer resident. In addition to it, there is also the so-called. downy mildew (peronosporosis), due to which the leaves of cucumbers are first covered with colorless pigments on the underside. Quickly corroding the tops layer, fungal spores emerge in the form of small brown inclusions. It’s good that the measures to combat powdery mildew and downy mildew are the same.

Downy mildew on cucumbers

In general, pruning of cucumber leaves should be done in cases of mosaic disease, fusarium, etc. But spores of harmful fungi, flying through the air, can easily cover the entire plant. Accordingly, in the fight against dew, it is better to focus on the growing conditions than to treat the symptoms themselves, which is precisely the disease.

Video “Downy mildew on cucumbers, control measures”

Just as mushrooms grow throughout the forest after a long rainfall, so spores of the harmful mycelium of powdery mildew cover vegetable and garden crops after regular spraying and even watering. The culprit has been identified - excessive humidity.

Moreover we're talking about O high humidity air and earth at the same time: the soil evaporates moisture upward, making the atmosphere “bathhouse”. Therefore, powdery mildew on cucumbers in a greenhouse is less common than on cucumbers growing in the open air: in the unstable climate of Russia, temperatures of +20-25 °C sometimes alternate +15-18 °C, which contributes to the formation of “frost” on the top and large leaves. The corresponding fluctuation often occurs in May and August, when cucumbers are young or ripe. But the retention of moisture inside the soil provokes excessive evaporation, which is why the lower leaves of the cucumber “rust”, because suffer from peronosporosis.

To reduce the risk of diseases, growing young cucumbers through seedlings, as well as their prevention, makes sense by default. In this case, you will have to pay a lot of attention to watering. It must be carried out strictly according to schedule, guided by growing conditions:

How to water cucumbers correctly

Powdery mildew on cucumbers, how to water

The question is how to get rid of powdery mildew, which is caused by excessive moisture, if you have to water the cucumbers quite often? It’s simple – you need to use an integrated approach:

• Firstly, the watering regime implies not only a schedule, but also water consumption. This indicator varies depending on the age of the cucumbers (the larger the bush, the greater the consumption), but in any case, the volume of water consumed should be such that by the time of the next watering the land where the crop grows has time to dry out a little;
• Secondly, cucumbers do not tolerate cool and especially cold water. It sits in the ground for a long time and causes stress in the plant, causing the leaves and greens to curl;
• Thirdly, the prevention of powdery mildew necessarily involves enriching the soil with phosphorus and potassium. Wood ash is rich in the last element, which is why it is so often recommended to pollinate the ground and leaves of cucumbers. Phosphorus releases superphosphate, as well as complex fertilizers. But root feeding with nitrogen fertilizers like saltpeter or urea should be completely abandoned, because they increase the acidity of the soil, after which the latter becomes heavy, which impairs the ventilation of the root system;
• Fourthly, downy mildew first covers the lower leaves, which indicates waterlogging of the soil. To ensure that the latter evaporates less moisture, it is recommended to cover it with mulch in the form of straw, tree leaves or agrofibre. By the way, with a mulched layer, the soil stores more moisture, so the watering schedule can be reduced;
• Fifthly, cucumbers must be provided good lighting. Shade reduces air temperature and promotes humidity, so green vegetable beds must be cleared of weeds and thinned. This is especially true for seedlings, which some gardeners often plant densely;
• Sixth, small but constant watering is better than abundant watering. Accordingly, it is beneficial to moisten the soil drip tape than a watering can. The use of the latter is a tradition for many, but because of it, water often gets on the stems and foliage of the vegetable, which only contributes to powdery mildew on cucumbers.

On a note

The soil can be of different types - sandy loam, loamy, peat, turf. Last – a good option for growing cucumbers, but to get it, you need to go to the forest planting. Sandy loam soil does not store moisture well, loamy soil is viscous, peat soil is nutritious but “sour.” Therefore, to prevent various diseases, including powdery mildew, cucumbers should be grown in mixed peat-turf substrates.

But how to fight for the future health of cucumbers if there is no way to prepare universal soil? It’s simple: when choosing a site, it makes sense to at least be guided by the vegetable crop that grew the previous season. The fact is that the soil can be contaminated, so the best predecessors for cucumber are legumes and root vegetables; acceptable - tomato, cabbage and bulbous; the worst are potatoes and pumpkins, especially cucumbers themselves.”

Cucumber variety resistant to powdery mildew

Choosing a cucumber variety that is resistant to powdery mildew

The fight against powdery mildew on cucumbers can be completely eliminated if you use resistant cucumber hybrids. They are bred by breeders by crossing several varieties in humid conditions. The mark “F1” indicates hybridity. Among the relevant representatives, the most well-proven ones are:

• Anyuta F1;
• Voyage F1;
• Darling F1;
• Pasadena F1;
• Octopus F1;
• Murashka F1;
• Boy with Thumb F1;
• Darling F1;
• Crane F1;
• Fontana F1;
• Phoenix plus F1;
• Benefit F1;
• Sir F1;
• Princess F1;
• Ibn Sina F1;
• Julian F1 et al.

Moreover, some hybrids have complex resistance to common diseases of cucumbers - ascochyta blight, mosaic blight, fusarium blight, tobacco mosaic. Adequate immunity is not a guaranteed panacea. Moreover, when choosing cucumber seeds, you must also pay attention to their ability to self-pollinate, early ripening, taste, suitability for preservation, etc.

We use drugs

Despite the abundance of techniques and means to prevent “whiteness” and “rust”, many vegetable growers, hoping for chance, are faced with thematic scourge “head-on”, and only then take up the treatment of powdery mildew on cucumbers. Well, better late than never. The following table suggests considering the most effective drugs in the fight against powdery mildew.

Table “Preparations for powdery mildew”

Name Category Method of administration, dosage Disadvantages Overall rating on a 10-point scale

"Baktofit"	Biofungicide	Spraying: 20 ml per 10 liters of water; Watering at the root: 20 ml per 10 liters of water	Washed away by precipitation	9+
"Fitosporin-M"	Biofungicide	Spraying: 6-10 g-ml per 10 liters of water	Does not tolerate light well	9
"Topaz"	Fungicide	Spraying: 3 ml per 10 liters of water	Prohibited during fruiting period	8+
"Quadris"	Fungicide	Spraying: 6 ml per 10 liters of water		7
"Tiovit Jet"	Fungicide	Spraying: 30-50 g per 10 liters of water;	Prohibited during hot weather and fruiting period	7
"Hom" (copper oxychloride)	Fungicide	Spraying: 40 g per 10 liters of water	Washed off by precipitation, prohibited during fruiting period	7+

To prevent downy mildew, control measures are kept to a minimum, it is better to spray cucumbers with biofungicides and fungicides in advance - 2-3 times during the entire growing season, i.e. every 2.5 weeks.

Although biofungicides can be used during fruiting, vegetables treated with them are allowed to be consumed 2-3 days after treatment. Also pleasing is the presence of useful micro- and macroelements in the composition of biofungicides.

Folk remedies

In addition to industrial preparations, powdery mildew can be combated with folk remedies. They are less effective, but economical and natural, which makes them suitable for use even during the period of active formation of ovaries.

When you mix a teaspoon of soda and soap in 10 liters of water, you get a good antifungal solution, which should be sprayed on cucumbers once a week for 2-3 weeks.

To prepare this product, you must first boil 100 grams of “tea” for 2 hours field grass and a liter of water. Next, one part of the solution should be diluted with 5 parts of water, after which the solution is ready for spraying. Treatment is carried out 4 times every 3-4 days.

To the question “there is powdery mildew on cucumbers, what should I do?” was solved in a week, you can infuse medium garlic in water at room temperature. The resulting tincture remains to be strained so that it does not clog the spray bottle.

Video “Powdery mildew on cucumbers, what to do”

Prevention of powdery mildew infection of cucumbers

Although cucumber is a moisture-loving vegetable, you should not overdo it with watering. Otherwise, powdery mildew on cucumber will not be long in coming; measures to eliminate it are as follows:

• Selection of seeds of a resistant hybrid “F1”;
• Planting in well-lit and high-quality soil, where a foreign crop previously grew;
• Laying a mulch layer on top of the topsoil;
• Optimal mode glaze;
• Top dressing phosphorus-potassium fertilizers;
• Thinning and loosening of beds;
• Preventive spraying.

It turns out that powdery mildew is easier to prevent than to treat. An integrated preventative approach seems difficult, but it is better to apply it in a timely manner than to lose 50-100% of the harvest due to disorganization.

Video “A word from the agronomist about cucumbers”

veselyi-yrozhainik.ru

Like powdery mildew. This is a fairly common virus that, unfortunately, many people have to fight. In our article we will look in detail at what powdery mildew is, why it appears on people and what measures exist to combat it.

Why is powdery mildew dangerous?

First of all, it is worth determining what powdery mildew is a fungal disease. That is, it actively thrives in cold and damp conditions. It is dangerous because the infected plant, in addition to losing its decorative look, loses all vitality: it stops growing and developing, its shoots quickly wither, dry out and die, and the fruits turn black and rot. If you do not notice and stop the spread of the virus in time, it will very quickly attack everything, and obtaining even a minimal harvest becomes unlikely.

Signs of appearance on cucumbers

Infection usually occurs at the beginning, when the heat is replaced by rain and a sharp cold snap. The first sign of this infection will be the appearance of a white or yellowish coating on the lower leaves and at the base of the plant’s shoots.

You can also notice small brown balls (spores) on the greens. After these spores mature, droplets of moisture form on the surface of the plaque - this explains the name “powdery mildew.”

In advanced cases, the plaque becomes very dense and acquires a brown tint. It rises from below and attacks the entire plant - its stems, cuttings, leaves, stalks and fruits. The plant becomes lethargic and painful.

Did you know? Powdery mildew is a universal fungus that attacks not only but also many other plants, such as cereals and many others. Breeders around the world are actively working, developing new varieties of these plants that are resistant to this disease.

Control measures

There are many ways to deal with powdery mildew on. But the main thing is to remember that regular thorough inspection makes it possible to detect infection in time, which means you have a better chance of completely defeating the disease and saving the harvest.

Preventive and agrotechnical techniques

• The first thing you need to do to prevent this fungus on yours is to follow. You should regularly change places for sowing the same crops, since over time in one area there is a high probability of the proliferation of viruses and diseases typical for a particular plant.
• And phosphorus fertilizers increases resistance to this disease.
• Each one should do a deep digging of the beds, removing all residues and.
• To prevent powdery mildew on cucumbers, you should carefully monitor the maintenance of optimal humidity and temperature of 23-25 ​​degrees.
• The first stems and leaves covered with plaque should be immediately uprooted and burned.
• Sowing hybrids that are resistant and invulnerable to this virus will minimize your chances of “acquaintance” with it.

Folk remedies

• One of the effective treatments for powdery mildew is considered to be diluted in the affected beds. Manure is diluted one to three with water, infused for two days, diluted three times again, filtered and ready for use.
• You can also use an infusion. To prepare it, you need to pour half a bucket of crushed flowers with warm water for two days. After this, 40-50 g of laundry soap are added to the strained infusion and the diseased plants are treated.
• Horsetail, namely its decoction, is also a very popular remedy for this fungus. For 1 kg of fresh or 100 g of dry horsetail you need 10 liters of water. Pour the herb for a day, boil for two hours, cool and strain, dilute the finished broth again in a ratio of 1:5. This “medicine” can be stored for up to a week.
• If you dilute 1.5 g of potassium permanganate in 10 liters of water, you get good mixture for treating areas covered with powdery mildew.
• You can even use regular kefir. It needs to be diluted with water and sprayed on diseased plants.
• Can be diluted in a liter of water soda ash with laundry soap in a 1:1 ratio. The resulting solution can be sprayed on the affected stems.
• For 150 g of ash - a liter of boiling water and a little laundry soap. Leave the solution for two days, strain and irrigate the infected cucumbers with it.

Biofungicides

When deciding how to get rid of powdery mildew in their beds, many choose the method of using biofungicides. This biological drugs, used to combat fungus. Their undoubted advantage is safety and non-toxicity. They can be used even at the moment of fruit formation, which is very useful when it comes to infecting vegetable crops such as.

The most popular products are: “Planriz”, “Pseudobacterin-2”,

When growing various crops, gardeners often encounter various plant diseases that negatively affect the harvest. Powdery mildew on cucumbers is a common disease in agricultural practice that affects plants. Exists a large number of ways to cope with the disease, but the most effective is the prevention of powdery mildew.

Powdery mildew is a fungal disease of vegetables that affects the stems and leaves. Fungi colonize the epithelial cells of the plant and contribute to the formation of mycelium - this is a white coating. The incubation period of fungi lasts from 3 to 5 days.

Favorable conditions for the appearance of powdery mildew are abundant humidity and warm weather. If in summer warm weather It rained for several days in a row, then after a few days you can notice a white coating, and then yellowed leaves.

The most favorable temperature ranges from +16 to +22 degrees. Also, infection requires a large amount sunlight. Sudden changes in temperature during the night and day weaken the immunity of cucumbers, which contributes to rapid infection with powdery mildew.

In addition, powdery mildew appears when:

• Heavily thickened plantings of vegetables;
• A large amount of nitrogen in the soil;
• Overdrying or, conversely, overwatering the soil;
• Watering the beds when the top layer of soil has not yet dried out.

A damaged plant looks like this:

• A white fluffy coating appears in the form of spots on the leaves and stems of cucumbers;
• Wilting of leaves;
• Decrease in yield;
• The leaves become curled and then begin to fall off.

To treat powdery mildew on cucumbers, you can use traditional methods that are not inferior in effectiveness to chemical agents. They are also safer.

Prevention of cucumber diseases

The most effective way to cope with vegetable diseases is prevention. It is enough to follow simple rules for growing and caring for cucumbers and you will never have to treat plants for powdery mildew. It will take much less time to take preventive actions than to fight an already existing disease.

• To plant you only need to choose quality seeds. Before sowing into the soil, they must be disinfected.
• Before planting both seeds and seedlings in the soil, you need to ensure that the soil is warmed up. Minimum temperature soil should be +12 - +16 degrees.
• Seedlings should be planted in pre-prepared soil. The soil is carefully dug up, all weeds are removed and watered with a solution of potassium permanganate. Then they mix it with manure and only then plant the seedlings.
• All plant residues after harvesting are burned away from the site.
• It is recommended to choose those cucumber seeds that indicate disease resistance.
• The beds are weeded regularly. Weeds not only prevent vegetables from growing, but also transmit diseases.
• Diseased leaves should be disposed of immediately to prevent the fungus from spreading further. They should be removed as quickly as possible.
• Regular application of fertilizer. Fertilizing needs to be done several times per season.
• It is important not to forget about crop rotation. Every year the place for sowing cucumbers should be changed. This will prevent powdery mildew from re-infecting your vegetables. If the soil has been contaminated, then in such places it is necessary to plant crops that are immune to powdery mildew.

Ways to prevent illness are always the most effective method to preserve the harvest.

How to fight powdery mildew using traditional methods

Powdery mildew can be found not only on cucumbers, but also on other vegetables. It most often affects leaves, less often - stems, roots and fruits. Immediately after the first signs of powdery mildew appear, measures must be taken to treat cucumbers. For this you can use folk remedies.

Measures to combat powdery mildew on cucumbers:

• Soap and wood ash solution

You can cure cucumbers using laundry soap and ash. Grate the soap and mix with 200 gr. wood ash. Pour warm water over everything and mix thoroughly until the soap dissolves. Treat the bushes 3 times a week.

• Powdery mildew soda

You can cure cucumbers from powdery mildew using baking soda. You need to take 100 grams. soda, 75 gr. vitriol and 10 liters of water. Mix all ingredients and process cucumbers. It is necessary to water the soda liquid first on the foliage.

• Garlic

How to fight powdery mildew on cucumbers using garlic? Chop the garlic cloves along with the herbs and add water. Leave to infuse for 12 hours. Then spray the cucumber leaves for two weeks. You can also water part of the land where cucumbers grow with the infusion.

• Mullein

On cucumbers, powdery mildew can also be controlled with the help of rotted mullein. Using this remedy, cucumbers can be protected from death. 1 part mullein should be mixed with 3 equal parts water. Mullein should be infused for 3 days. You can process bushes both in open ground and in a greenhouse.

• Kefir

If you do not start treating cucumbers in time, they will turn yellow very quickly. To save the leaves, use kefir (you can even use expired one). The foliage is watered with kefir every 3 days.

• Potassium permangantsovka

If cucumbers have a white coating, potassium permanganate will help deal with it. 2 gr. Dilute potassium permanganate in 10 liters of warm water. Spray the cucumbers with the resulting solution for 2 weeks. If the plaque does not disappear, then spraying can be continued.

Chemicals for cucumbers

In order to get rid of powdery mildew, a large number of chemicals have been created. Preparations can be purchased at any gardening store.

IN Lately Biofungicidal preparations are gaining popularity. They are safe and non-toxic. Biofungicides can be used even during the formation of ovaries and fruits. There will be no negative effects on human health.

What medications help get rid of powdery mildew:

• Fitosporin

Fitosporin is one of the most popular remedies used to combat vegetable diseases. Fitosporin contains biofungicides that are based on bacteria. It is with their help that the use of the drug Fitosporin slows down the growth of fungal mycelium.

• Topaz

If the leaves begin to yellow, then Topaz is used. Get rid of powdery mildew with this remedy for one week. But it is worth remembering that Topaz is toxic to humans, so it is better not to touch cucumbers during treatment. Active substance is penconazole. For 10 liters of water you only need one ampoule. You can spray the foliage of cucumbers with a freshly prepared solution. The remains after spraying are poured out. The foliage should be sprayed every two weeks.

• Tilt CE

Tilt CE will help get rid of powdery mildew. Suitable for spraying in greenhouses. The active substance of this drug is propiconazole, which inhibits the formation of fungal spores. Available in the form of an emulsion. An increase in temperature enhances the action of the active components of Tilt CE. To protect plants from the harmful effects of fungi, it penetrates directly into the tissue. For 10 liters of water you need to take 40 grams. facilities. A few hours after spraying, it appears on the plants. protective layer. It lasts for more than two weeks.

How to deal with downy mildew

In addition to powdery mildew, there is also downy mildew. The disease also mainly affects leaves. The main difference between these two diseases is that with downy mildew the leaves immediately turn yellow, and white plaque can not be.

If the leaves on the beds begin to turn yellow, then measures should be taken immediately. Experience shows that downy mildew is much more difficult to get rid of.

Factors that can trigger the appearance of this disease in crops are:

• Watering with ice water;
• Warm and humid air;
• Improper care of plants.

You can save the harvest using the following measures:

• Ventilate the part of the greenhouse where the cucumbers grow;
• Do not water the beds with cold water;
• Harvest periodically.

How to treat cucumbers with downy mildew

For treatment, you can use the same methods as when fighting the previous disease. You can also spray the beds with such preparations as:

• Ridomil;
• Cuproxat;
• Oksikhom.

Folk remedies are used to combat fungi. They are very effective and non-toxic to humans.