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.

fungal spores, causing disease plants with powdery mildew, live in the soil. They are almost always present there. But they begin to manifest themselves only under certain conditions. So, on a sunny day, warm weather, at 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 sign begins to appear on the leaves. white coating.

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 not exhausted by too much humidity. The fungus does not settle even where fertilizing was applied in a timely manner 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%;
— the presence of excess nitrogen in the soil;
- highly dense plantings;
— the soil often gets too dry and then flooded;
- watering is done when top layer soil is still wet.

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;
— carry out phosphorus-potassium fertilizing on time.

Another type of prevention against powdery mildew can be carried out 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.

The short term impact is very hot water does not have time to cause harm to plants that have not yet fully awakened after winter. But spores, mycelium, as well as 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 a 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 option:

— 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:

- whey - 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. Copper sulfate solution 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 ends - 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 class of danger - toxic to fish, but not dangerous to beneficial insects and birds. Considered moderately dangerous to animals and humans.

« Tilt CE » - 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: “ Byleton », « Sulfaride », « Fundazol », « Previkur », « Acrobat MC », « Score », « Vitaros "and others.

indasad.ru

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 aphid, spider mite, sprout fly.

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 most good predecessors for cucumbers there 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. Water the cucumbers only with 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 get to know everyone typical diseases, then it will be easier to treat the plants. Each disease is treated in 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

Causes of white rot: high humidity air in the greenhouse, a poorly ventilated greenhouse and a large planting of vegetables.

Brief characteristics 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 regime. 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 this 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 mold 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, appears due to low ventilation and high air 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.

Signs:

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 is stunted in growth, the fruits become small and not tasty.

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

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

The pests in the greenhouse are aphids, they sit on the inside of the leaves, on the 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 laundry soap with lye or you can take wood ash with soap. 100 g soap, 200 g lye, 200 g wood ash and 10 liters of water.

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 and organic substances;
• to protect the plants, you need to treat the entire area of ​​the greenhouse with chemical fertilizers;
• Before planting, you need to prepare and cultivate the soil. In advance, in the fall, you need to apply fertilizer. Repeat the process in the spring;

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

ParnikiTeplicy.ru

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 by various diseases: powdery mildew, peronospora, 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 when dew appears.

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.

Given fungal disease It 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 relative humidity air 70-80%. For protection legumes against powdery mildew, sources of infection should be destroyed, and preventive measures, 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.

To protect pumpkin crops from 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):

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Signs of powdery mildew on cucumbers (see photo) are: brown spots small size, covered with a white coating (also called mycelium). At first a small area is affected, 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 from weeds. To do this, you will need the following 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 you should 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 best option plant protection.

In addition to a natural herbal cocktail for powdery mildew on cucumbers, folk remedies are used - whey and a mixture of mullein and urea in a proportion of 10 liters. 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 drugs, 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 appearance 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 soil. 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 proportions 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 the 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 viral disease, which manifests itself during the period of their active fruiting. A gray coating may appear on leaves, stems and fruits, especially in the 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 this 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, the root system should be slightly exposed (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.

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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

bbbbbbbbbbb

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 of the cucumbers is coming - their deadline has already expired. 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.

Powdery and downy mildew appears on cucumbers in the form of spots and plaque. If you do not start taking measures, then soon the cucumber vines will begin to dry out and die. Therefore it is necessary to know effective ways prevention and control of these dangerous diseases.

Powdery mildew

Signs

If spots appear on the leaves of cucumbers round shape white or cream color - this is the beginning of a disease called “powdery mildew”. Externally, the disease looks like the leaves and stems are sprinkled with flour. The causative agent is a fungus that develops on plant tissue. It can affect them from the moment the green mass grows.

White spots on cucumber leaves are first found on the upper surface. They grow rapidly both in size and quantity. Merging, they move to the lower parts of the sheet, covering everything powdery coating white. Leaves affected by the disease turn pale, acquire a light yellow color, then turn brown, curl and dry out. If treatment is not carried out, then the stems and even the fruits become infected. Cucumber vines do not develop, are chlorotic in appearance, and begin to gradually die off. The disease spreads quickly and appears soon like a white coating on cucumbers. Infected fruits are underdeveloped and tasteless, lack sugar content, and are often deformed. Later the plant dies.

Reasons

Powdery spots are overgrown mycelium on which conidia form. They will serve as a source of infection in the future. The fungus overwinters on the remains and rhizomes of infected garden crops and weeds (sow thistle, chicory, plantain, etc.), and in the spring the infection with drops of moisture falls on young cucumber leaves. The latent period of infection is very short - only 4-6 days.

A pathogenic fungus can produce many generations over a season, so powdery mildew on cucumbers spreads rapidly and is quite difficult to remove.

If cucumber beds have been located on the same piece of land for many years, then the pathogen in large quantities accumulates in the soil. Infection can also spread to cucumbers from mycelium-bearing plants planted nearby.

Distribution factors

Powdery mildew on cucumbers in a greenhouse is more common than in the open air. Excessively humid greenhouse conditions and insufficient ambient air temperature are very suitable for the life of the fungus, which is especially typical for greenhouses and unheated greenhouses early spring. The presence of condensation on the walls and film also contributes to the disease.

An outbreak of the disease also occurs when watering with cold water is incorrect. If in garden beds the reduction in yield reaches 50-85%, then in greenhouses the damage can reach 100%.

How to fight

Today, there are different ways to combat the disease. Along with modern drugs against powdery mildew, gardeners do not forget about folk methods, rightly considering them more harmless and accessible. Let us consider in detail how to effectively treat cucumbers if they do get sick. The following measures can help against powdery mildew:

Signs

This dangerous fungal infection, otherwise called peronosporosis, for lately has spread widely and can affect cucumbers at any stage of growth.

Be alert for signs of downy mildew! If urgent measures are not taken, the plantings will quickly die.

The causes and conditions for the spread of peronosporosis are similar to ordinary powdery mildew.

The fungus appears on the leaves as green-yellowish multifaceted spots that appear oily in appearance. Rapidly increasing in size, they cover the entire upper surface, and in the lower part they appear in the form bluish-purple bloom. You can see what this type of fungal infection looks like in the photo.

The leaves begin to turn brown, as if the plant had been burned by something. It will wither and dry out if it is not carried out in time. necessary processing cucumbers

How to fight

It should be noted that downy mildew is more difficult to deal with than ordinary powdery mildew. The main thing here is carry out preventive measures in time and also prevent the disease from spreading. The following methods give good results:

To save cucumbers from fungal infections, you need to:

1. Promptly remove old tops, plant debris and weeds around the plantings.
2. Dig the soil deeply in the fall.
3. Plant seeds in the old place only after 3 years.
4. Alternate crops when growing; the best predecessors are onions, cabbage and legumes.
5. Plant varieties and hybrids that are resistant to the disease. Cultivation of early varieties and hybrids will also provide protection. This way you can avoid a dangerous outbreak of the disease, which begins during the cool nights towards the end of summer.
6. Constantly maintain in greenhouses normal temperature and humidity level.
7. Watering, especially in cloudy weather, should be done only with warm water, and it is important to ensure that it falls strictly on the soil and not on the leaves.
8. Fertilize with potassium and phosphorus according to the schedule, which increase the plants’ resistance to infection and are a good prevention of powdery mildew in beds with cucumbers.
9. If you use the drug Rizoplan as a preventive measure, then downy mildew on cucumbers may not spread further. When working with it, follow the instructions, but usually you only need 2 tablespoons per bucket of water.
10. After the final harvest, greenhouses are treated with a solution of copper sulfate, based on 3 tbsp per bucket. means, well shedding the soil. All infected plants are removed and burned off-site.

Safety precautions

When fighting powdery and downy mildew on cucumbers, you often have to resort to toxic drugs. There are a number of rules that must be followed when using them so as not to harm your own well-being:

1. Wear protective clothing, gloves and a mask when working.
2. Treatments with toxic substances are not carried out during flowering of fruit and berry crops so as not to kill pollinating insects.
3. It is better to spray in cloudy weather so that the plants do not get burned.
4. Before eating, rinse all processed vegetables thoroughly with warm water to remove any remaining preparations.

As you can see, powdery mildew and downy mildew are not that bad if you know how to destroy them.

Cucumber diseases are especially active in the second part summer period, which is associated with the occurrence of cold pre-dawn dew. Some of them attack plantings at the very beginning of the growing season. One of the most dangerous fungal diseases, which can provoke a large loss of yield, is called powdery mildew on cucumbers. How to recognize the disease and begin to take measures that exist effective methods prevention, read our article.

Favorable factors for the spread of the virus are warm and damp weather conditions. 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. Decreased immunity vegetable crops sharp changes in day and night air temperatures contribute to pathogenic effects.

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 whitish spots or light reddish spots. 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”

Look what they look like greenhouse cucumbers, the leaves of which are 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 to treat 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 temperature environment. 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.

You can also treat vegetable plantings to combat fungal infections with 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.

Quite varied and traditional methods struggles that 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 of mustard powder are stirred in 10 liters of 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.

A solution of rotted mullein will also come to the aid of cucumber plantings - 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 of yellow, rather than white, spots on the surface of the leaves. 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 cannot 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 territory (removal of plant debris and weeds from it), adherence to the rules of crop rotation (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. They do this quickly using a watering can with a diffuser.

This effect does not harm plants waking up after hibernation, but it 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.

Many gardeners face this problem every year: within a few days, the leaves of the cucumbers turned white and began to fall off. What kind of harvest can you dream of? Many say: passed acid rain. But what about in greenhouses, where not even a drop of rain falls?! It's not the rain. Powdery mildew causes great harm to cucumbers, especially when grown indoors. This is mainly caused specific features their cultivation in small amateur greenhouses. This is the lack of basic crop rotation, a limited range of cultivated crops, the lack of necessary drugs and basic skills to combat this insidious disease. Moreover, it affects not only cucumbers, but also pumpkin, zucchini, squash, turnips, radishes, lettuce, beans, etc. Powdery mildew causes especially great harm to plants at high air humidity, especially with frequent dew and sudden temperature fluctuations, poor ventilation, watering with cold water, etc. The disease causes a severe reduction in yield and a significant reduction in the growing season.

The disease most often affects fruiting plants. First, round spots covered with a white powdery coating form on the upper side of older leaves, and then on the lower side. They then increase in size and appear on the underside of the leaves, covering the entire leaf. Diseased leaves become light, brittle, curl upward and dry out quickly. With severe damage, plaque may also appear on petioles and stems. In this case, individual lashes may even dry out.
Powdery mildew develops especially quickly if there is drip moisture in the greenhouse. That is why often the first foci of the disease appear near windows, broken glass, where droplets of moisture fall on the surface of the leaves. In greenhouses, the disease progresses rapidly at a temperature of 20-25 degrees C and a relative air humidity of 80%. The fungus overwinters on the remains of diseased plants, as well as on plantain, sow thistle, phlox, and in the spring it again infects young leaves of cucumbers.
It is difficult to defeat powdery mildew, but it is possible if you use the entire range of preventive and eradication agents. First and most important is the observance of garden crop rotation when growing cucumbers in open ground, and in closed ground, if there are 2 greenhouses, alternately growing cucumbers and tomatoes in them.
It is important to grow varieties and hybrids of cucumbers that are relatively resistant to powdery mildew - Mazai, Saltan, Faithful Friends, Moscow Evenings, Farmer, Emerald, Othello, Mirinda, Aquarius, Electron, etc. By the way, the range of such varieties in the trade is quite solid. But let's be honest and try to remember - did this interest you when choosing a variety?
Equally important is cleaning 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 (more precisely, with sulfur dioxide from burning these briquettes), having previously sealed all the cracks in the greenhouse. Deep autumn digging of the soil is of great importance. During the growing season, it is of exceptional importance to maintain the air temperature in the greenhouse within 20-25 degrees C and water the plants only with warm water. At the same time, it is necessary to support normal humidity soil and air, ventilating the greenhouse if necessary.
When the first leaves affected by this disease are discovered, they must be carefully cut off and immediately destroyed or placed in a bucket with a 0.5% solution of copper sulfate. At the same time as part mineral supplements it is necessary to significantly increase the dose of potassium fertilizers.
Against powdery mildew during fruiting, plants should be regularly sprayed with a solution of copper sulfate (1 tsp per 10 liters of water), soda ash (20 g per 10 liters of water) or potassium permanganate (3 g per 10 liters of water). Colloidal sulfur will help: 10 liters of water and 20 grams of 70-80% sulfur. An excellent and lasting result in the fight against powdery mildew is given by the ancient remedy of our grandmothers - an infusion of mullein or rotted hay.
It is not difficult to prepare such a “potion”. A kilogram of mullein or hay is poured with three liters of water and allowed to brew for 3-4 days. Then the solution is diluted with water in a ratio of 1:3 and used on the day of preparation. With an interval of 7 days, the treatment is repeated 1-2 more times. Spray the plants better in the evening or in cloudy weather, be sure to spray both sides of the leaves. If there is no mullein or rotted hay, then take 1 liter of whey, skim milk or buttermilk, add 5 liters of water and spray the plants. This will also reduce the severity of the disease to some extent. According to the observations of many gardeners, spraying cucumbers with an infusion of fermented grass gives a certain effect.
And if you don’t want to use the effective means of our grandmothers, then there are plenty of excellent modern means in the trade.
Very good result gives spraying of plants with the preparations “Topaz”, “Barrier”, “Vectra”, “Zircon”, “Immunocytophyte”, “Fitosporin”, “Oxychom”, “Zaslon”, etc.
The use of the antibiotic trichocetin gives excellent results. This antibiotic is obtained from the trichothecium fungus. When spraying plants with this preparation 2-3 times per season for the purpose of prevention before the disease appears, it can be completely prevented. The drug combines well with the use of trichodermin.

There is also such a scourge of cucumber plants as southern powdery mildew: light yellow oily spots appear on the leaves, which then turn brown, and a blue-violet raid. To avoid this, you need to regularly foliar feeding: for 10 l. water 50 gr. urea, 2-3 gr. copper sulfate and boric acid, a little potassium permanganate. With this treatment, the number of leaves increases, the intensity of disease damage decreases by a third, and the yield increases. Why? Because urea rejuvenates plants, copper and manganese inhibit the development of the disease, and boron helps fruit set. Feeding is best done in the morning.

​Similar articles​

​In most cases, infections can be avoided by following safety precautions when planting, proper fertilizer and watering. Follow the recommendations professional gardeners and reap a rich harvest.​

For prevention, the land should be irrigated properly. Moisture is favorable for the spread of most insects, but only dry soil is suitable for mites. Garlic or onion infusions (10 liters of water and 200 g of husks) will help destroy colonies. It is necessary to spray the bushes 4 times a season.

​This disease can be widespread or spread in patches in gardens and greenhouses without proper heating. Fungal diseases cucumbers affect plantings at different moments of their growth. The problem with fusarium is that the infection may not manifest itself in any way until the plants enter the fruiting phase, when they begin to wilt and die. Anthracnose appears as yellow-brown spots

Powdery mildew of cucumbers

​The soil needs to be loosened and fertilized properly.​

​Efficient and reliable way combating powdery mildew on cucumbers - spraying with Topaz. This remedy can also be used to prevent the disease.​

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Treatment of cucumbers for peronosporosis - the most effective recommendations

And, of course, it is necessary to spray the plant itself on the green leaf. The drug Planriz, based on an herbal extract, is well suited for this and prevents the disease. Of course, our breeders take measures not only to combat this disease, but also develop plant varieties that will be more resistant to downy mildew. When purchasing seeds, pay attention to the description of the variety. Gardeners must take certain measures on their own to avoid the occurrence of this disease.​

Symptoms of the disease

It is not difficult to identify downy mildew on cucumbers. It appears as massive brown and yellow spots on the foliage of the plant and affects it at all stages of development. You can visually see downy mildew in cucumbers in the photos posted by gardeners on the Internet.​

The most common disease of cucumber is powdery mildew. In addition, these plants also attack infections such as mosaic and root rot. Each of them has its own methods of combating, as well as preventive ones. Let's take a closer look at them.​

​Burn the tops and treat the ground with Hom​

​Voracious whitefly larvae​

• ​Fusarium wilt of cucumber, the treatment of which does not bring the desired results, must be prevented at the planting stage. You can avoid infection:
• ​Yellow-brown spotting on the foliage and pink bloom on other parts of the bushes are most often a consequence of anthracnose, which develops to a greater extent with excess moisture. At first, barely noticeable mucus appears on the crop, but in places where it is concentrated, small ulcers almost always form, which lead to the death of the bush.
• This disease of cucumbers is considered the most common. Its signs are noticeable not only on the leaves (small white spots gradually covering the entire surface), but also on the stems with petioles. The disease turns the lashes completely brown, they dry out and fall off.
• ​The remains of last year's plants must be removed from the beds, as they may contain insect larvae and viral bacteria.​

​Growing cucumbers is quite a troublesome task. The following conditions must be met:​

Treatment and prevention of peronosporosis of cucumbers is also carried out using chemicals.

​For example, plant early varieties, which makes it possible to get a harvest before the onset of cold weather, during which peronosporosis develops favorably. Since there is a risk that the seeds are already infected with this disease, it is recommended to treat them with a 0.1% solution of potassium permanganate before sowing.

These spots tend to grow very quickly, which ultimately leads to drying out of the cucumber foliage. The disease affects both plants growing in a greenhouse and those grown in open ground.​

​Root rot is a dangerous disease caused by a fungus. Infected plants begin to rot in the root collar area. As a result of this, the lashes die off. This cucumber disease, like most infections, is easier to prevent than to treat later. Most often, plants are affected as a result of waterlogging of the soil and air, for example, in greenhouses, as well as during sudden temperature changes. Therefore, you should not water cucumbers too often. In addition, if cold temperatures are expected in spring period, in open ground, plants are covered with film.

​I wouldn’t like to say something sad, but it seems to me that anyone will love powdery mildew on cucumbers. As the specialist said on the box, if the first spots appear on the leaves, the plant is 70% affected.​

The microscopic insect moves and lives no more than a day in the air, but manages to lay voracious larvae on the leafy part of the cucumber. They suck the juices from the crop, which leads to the development of sooty fungus.​

​seed dressing;​

What methods should be adopted to combat downy mildew?

Moreover, downy mildew can spread to nearby cucumber-related plants, such as:

If a cucumber disease such as root rot does appear, at the first signs of it, the stem is buried two internodes from the root with earth. And, of course, such plants need to be cared for especially carefully: weeding, loosening, feeding. Strong cucumbers will better resist disease. This is one of the main preventive measures. In addition, you should not leave last year’s tops in the garden. It needs to be raked and burned.​

​Focus on PREVENTION!!​
It is difficult to neutralize the whitefly due to its fertility. The methods for removing insects themselves are not that complicated; it is enough to regularly wash off the larvae from the bushes and loosen the soil, followed by adding peat or humus to it. Spraying with Inta-Vir will help get rid of colonies already collected on the leaves.​

​maintaining required humidity and temperature conditions in greenhouses;​

​To prevent cucumber disease in the greenhouse and on plots, it is necessary to sow only proven seeds in sufficiently warmed and treated soil. It is better to purchase seed material from friends, from official agrotechnical companies, or to prepare it yourself. When anthracnose has already manifested itself, treating cucumbers against diseases with folk remedies helps:

If powdery mildew appears on cucumbers, measures to combat it will consist of pruning the affected parts of the stem and disinfecting the soil. Recommended processing:​

​Do not forget that diseases of cucumbers in a greenhouse and their treatment require a thorough approach. In greenhouses, as in open gardens, they have great value frequency and rates of fertilizer application. It is not recommended to exceed the composition of the elements: urea (6-12 g), superphosphate (approximately 10 g), potassium chloride (approximately 8 g) and ammonium nitrate (no more than 6-7 g) per 10 liters of water.​

LetovSadu.ru

Methods for controlling powdery mildew on cucumbers

​preparation of seedlings and seeding material;​

​As soon as you notice downy mildew on cucumbers, urgent treatment of the plant is necessary.​

​This will be a real breeding ground for downy mildew fungi. Still very important point– never plant cucumbers, pumpkins, and zucchini every year in the same place. Choose a different area - this will certainly help avoid an outbreak of recurrent disease. Now regarding the soil in the greenhouse: after the end of the season and harvesting of the plant, you need to remove the top layer of soil. And then this area of ​​the greenhouse needs to be treated with a 0.1% solution of potassium permanganate.​

​zucchini;​

​Another cucumber disease - powdery mildew - affects the leaves of plants.​

KakProsto.ru

Diseases of cucumbers photo, description and treatment in a greenhouse, in open ground

​Good question. I'm also looking for an answer to this. I'm especially interested in downy mildew. When young cucumber leaves, green, beautiful, 5 -7 pcs. and then this disease attacks. How to protect them, how to effectively spray and water them. Which gardener has this experience?

• Ants breed aphids on cucumber foliage
• A thorough disinfection of the soil and treatment of the material with Trichodermin (5 g per 1 kg) will not hurt.
• ​a mixture of lime milk and copper sulfate;​

​ground sulfur up to 30 g for every 10 sq.m. vegetable garden;​

Diseases of cucumbers photos and their treatment: prevention

​The most dangerous thing for plants is treatment with the wrong means and fertilization with incorrectly chosen preparations, so it is important to identify the disease by external signs and know preventive and therapeutic methods.​

​careful care during the period of active growth.​

• Nowadays, combined fungicides are widely used for this: copper oxychloride, Efal, Ridomil Gold. These preparations are more suitable for spraying in a greenhouse. Acrobat MC has proven itself well on open ground.​
• ​The most important rule is to avoid seed contamination. To do this, it is recommended to plant cucumbers in places where the occurrence of peronosporosis is unlikely or even impossible. The heat treatment method is very good for disinfecting seeds. To do this, place the seeds in water at a temperature of +50 degrees for 15 minutes.​
• ​pumpkin;​
• At the first stage, a characteristic white coating appears on their surface. Then leaf blades begin to darken and eventually die. The disease is caused in the same way as in the first case, by a special type of fungus. The development of this infection is facilitated by high humidity and insufficient care of plants.​
• ​for a bucket of water, a liter of whey and 1 tsp. l. iodine, sprinkle generously on cucumber foliage, no diseases, harvest until October.​
• ​These are pests that dig millions of underground tunnels and promote the appearance of aphids on leaves and stems.​
• ​Most infections are carried by insects, so it is important to monitor their spread and take preventive measures in time.​

Diseases of cucumbers photos of leaves and fruits: treatment and prevention

​bleach solution (up to 40 g per 10 liters of water).​

White rot

​a solution of 3% colloidal sulfur up to 30 g per 10 liters of liquid.​

White rot of cucumbers appears on the stem

As a result, all the work may be in vain if the cucumbers are attacked by pests or get sick. In this case, the entire crop may be destroyed. That is why it is always necessary to use preventive measures when growing.​

Root rot

​These substances have their own characteristics, but the main rule is timely preventive spraying of young plants that already have 3-5 leaves, and further processing at the time when the first fruits begin to appear.​

​After harvesting the last harvest, be sure to destroy all plant remains and disinfect the soil.​

Powdery mildew

To combat powdery mildew, use a 0.10% suspension of Figon or Karatan. Treatment is carried out as plaque appears. However, you can spray the bushes no more than once a week. Diseases of cucumbers in a greenhouse can manifest themselves more acutely than in open ground, since the most favorable microclimate for this is created here. Therefore, when this method growing plants they need to pay more attention.​

​this problem does not work with tomatoes, from personal experience - there is no 100% remedy for late blight, I treat it twice with Redomil-Gold, I try to plant super-early varieties early, and when it starts to form 4-5 tomato clusters, I break off the vines so that they have time to produce a harvest before the mass harvest Late blight invasion - 90%

​It’s easy to fight them: using sweet baits (syrup) and dusting the ground with ash or lime. Having noticed ant nests, you can pour boiling water over them, dig them up, or pour plenty of kerosene on them (waste oil is also used).​

Pests of cucumbers - melon aphid

• ​Dark brown and olive spots are a sign of cladosporiosis​
• ​Deep digging of beds, scrupulous destruction of plant residues, systematic application of potassium fertilizers will also not be superfluous for prevention.​

Most often, cucumbers are affected by leaf diseases, which over time cover their shoots, tendrils, peduncles and ovary. With white rot, plants are completely covered with mucus and plaque. The infection develops especially quickly in greenhouses with dense plantings, high humidity and stagnant air.​

Long before planting, you should think about how to treat cucumbers against diseases and pest invasions, since most diseases cannot be treated and are easier to prevent.

​Remember, if you are late by at least 1-2 days, the plant may die and cannot be saved. It is also important to avoid over-treating cucumbers with fungicides, because this is a direct path to the accumulation of pesticides and harmful substances in them. These drugs have the property of stopping the growth of fruits, as well as reducing yields.​

​Try to maintain normal soil moisture during the growing season of the plant without overwatering.​

​watermelons.​

Anthracnose

A disease of cucumbers called mosaic also occurs quite often. It belongs to the viral category. This is also an unpleasant phenomenon that can lead to a significant reduction in yield. Most often, plants are infected with three types of this infection: yellow, white and green. Characteristic spots appear on the leaves and fruits of the plant, after which the tissues begin to rot. At the first signs of infection, you should water the soil with 0.1% potassium permanganate. It is also a good idea to spray cucumbers with formaldehyde (5%).

​grow in a greenhouse.. change the soil every 2 years, treat the inside of the greenhouse against diseases, do not thicken the plantings, ventilate during

Slugs mainly damage leaves, but they can also eat fruits.

​Small pests of cucumbers that mercilessly destroy ovaries, flowers and leaves are far from a curiosity for experienced gardeners, especially during rainy seasons. To destroy them, you need to take care of the correct rotation of plantings on the site, dig up and disinfect the soil, and carefully get rid of weeds.​

• ​Many of the cucumber diseases and their treatment discussed concerned damage to the foliage and stem, which caused the death of the plant itself. Cladosporiosis mainly damages the fruits themselves. Small but numerous spots of a watery type appear, which quickly grow and harden, which leads to cracking of the skin of the vegetable and its death.​
• Greenish bloom and yellow spots are signs of peronosporiasis

Cladosporiosis

​To get rid of white rot, you need constant temperature control, thinning of plantings and timely weeding. The affected parts of the bushes should be carefully cut off, and the wounds should be powdered with ash or slaked lime. With this disease of cucumbers in a greenhouse or in beds, it is necessary to disinfect the soil (1-2% manganese solution or nettle infusion), and in case of severe infection - it complete replacement 10-15 cm deep. Crops should also be sprayed special solution(10 liters of water, 2 g of copper sulfate and 10 g of urea).​

​Professional gardeners recommend following some planting and growing rules to avoid problems and additional care subsequently. It is from these simple tips you should start looking at diseases of cucumbers and the fight against them will not seem scary and endless.​

​Plants are susceptible dangerous diseases at different stages of development. Cucumbers are no exception. A common cucumber disease is powdery mildew. Timely treatment and prevention will help preserve the harvest.​

​Grow those hybrids that are less susceptible to this disease (Katyusha, Debut, Rodnichok, Golubchik, Idol, Zodiac and Photon). These varieties are grown both in open ground and in greenhouses. Most popular variety cucumbers grown in open soil - Phoenix 640.​

Diseases of cucumbers photo leaves treatment for fusarium

​This disease does not affect the fruits of the plant. But dried and fallen leaves, which are a source of nutrition for the fruit with useful substances, become a consequence of the drying of the entire vine. And this already leads to underdevelopment of the fruit, or to a decrease in yield. Therefore, marketable fruits are dull in color and tasteless.​

You can see diseases of cucumbers in pictures on this page. In addition to those described above, there are other, no less unpleasant infections. In order to minimize the risk of infection, it is necessary to follow agricultural practices: feed, weed, loosen the plants in a timely manner, and also avoid thickening. In this case, the cucumbers will remain healthy and you will simply get excellent harvest both in the greenhouse and in the open ground.​

​Do not overwater the tomatoes. Trim all lower branches and ventilate the greenhouse. And this cup will pass from you)​

• ​Insects are afraid daylight, so they choose to feast on fresh greens and fruit pulp at night. Dark droppings and characteristic shiny marks from slugs also do not contribute to improving the quality of the crop.​
• ​When aphids have already attacked the plantings, spraying them with fermented plants will help herbal infusion(1 kg is infused in 10 liters of liquid for 24 hours) or an ash suspension (10 liters of water, 50 g of soap shavings, 200 g of ash).​
• This disease is also called olive spot, which can spread directly through the air, infecting areas with cucumbers during irrigation or during rains.

Pests of cucumbers with photos and their treatment. Ways to fight

​The enemy, which destroys entire fields, appears as a greenish bloom and yellow spots on the upper part of the foliage. It has the ability to spread to the entire surface of cucumbers and infect plantings growing in the immediate vicinity.​

melon aphid

​The consequences of root rot​

​To prevent diseases of cucumbers, photos of which are in the article, from interfering with rooting and growth, you should give preference to resistant varieties.​

​Powdery mildew is a common disease. You can detect a disease on a plant by looking at the leaves - they are covered with a white coating. First the leaves turn white, then dry out and die. Powdery mildew spreads quickly when the temperature drops and when watered with cold water. It is necessary to fight the disease when the first signs appear.​

Spider mite

​When growing vegetables in a greenhouse, it is recommended to maintain the microclimate in it as much as possible. This will help prevent dripping moisture from appearing on the foliage. If you notice that spots appear on the leaves, they should be removed immediately, without leaving stumps.​

Since downy mildew is a fungal disease, its reproduction occurs through the spread of spores, or more precisely, zoospores. Their unique shape with a flagellum allows them to move through liquids. And each watering of the plant contributes to their favorable reproduction and infection of more and more new plants.

​Cucumber is a very ancient vegetable. It appeared 6 thousand years ago. It was originally grown in the tropics and subtropics of China and India. This product is a real storehouse of vitamins. It contains vitamins B, C, potassium, phosphorus, iron, magnesium, and also promotes the rapid absorption of animal fats. That's why meat dishes goes very well with salads or salads that contain this the healthiest vegetable. But, sadly, every year growing cucumbers becomes an increasingly more difficult process.​

Whitefly

​Powdery mildew treatment with TOPAZ. during the harvest period THIOVIT JET, FITOSPORIN. , ALIRIN. For tomatoes PROFIT GOLD

Regular digging up of areas and pollination with ash or chalk will help to destroy pests. You can also try to lay out special shelters in which the slugs will find refuge, and collect them during the day. It is also recommended to treat cucumber beds with Metaldehyde.

Spider mites reproduce in hot weather

Ants

​Preventive treatment of cucumbers against diseases is provided with a 15% suspension of Bordeaux mixture. However, the problem may not be completely resolved. If remedies do not help, and infected cucumbers constantly appear, airborne diseases are prevented by reducing humidity and choosing the most resistant varieties.​

​Downy mildew, as peronosporosis is also called, can spread rapidly due to frequent fogs, large quantity dew, too cool watering and temperature changes.​

The disease is dangerous for the measles system, because it causes part of the rhizome to die, and the stem itself becomes rotten, and the plant dies before our eyes. Root rot is caused by cold weather, heavy and too wet soil and poor quality seeds. Almost all diseases of cucumbers of an infectious nature are dangerous because the pathogen can remain in the beds, in greenhouses or in uncollected plant debris for quite a long time.

Slugs

High-quality and disinfected seeds are suitable for planting. They should be purchased from trusted manufacturers or prepared independently, and also additionally treated with disinfectants (Grandsil and Grandsil Ultra).​

Spraying with a special solution will help cope with the disease. For 10 liters of warm water you need to take 1 liter of liquid mullein and 1 tbsp. spoon of urea. The solution must be stirred well and filtered. The leaves are sprayed from both the lower and upper sides.​

​It is very important to increase plant resistance to possible diseases, by fertilizing with mineral and organic substances.​

Bottom line

Even plant seeds can be carriers of the spores of this fungus. What’s even worse is that pests can successfully survive the winter on last year’s leaves that fall on the ground. Downy mildew can affect a plant at all stages of its development, starting from the growth of the first leaves and ending with the ripening period.​

​There are many diseases, and new ones appear that interfere with its growth, productivity, and even lead to the death of the plant. Infectious diseases inhibit the growth of the plant, and it doesn’t matter whether it grows in open ground or in a greenhouse. Today we will talk about such a disease as peronosporosis.​