Treatment of diseases of cucumbers in the greenhouse after planting, means for processing

During the cultivation of cucumbers, many vegetable growers face a considerable number of problems, since these plants often suffer from various diseases. At the same time, viral diseases of cucumbers can appear even if they are grown in a greenhouse.

Quite often this happens due to the use of small greenhouses or violations of the growing rules. To restore the health of the bushes, it is necessary to study in advance the diseases of cucumbers in the greenhouse and their treatment.

Causes of diseases

Diseases of cucumbers in the greenhouse can appear due to certain predisposing factors or conditions. There are several reasons why the bushes start to hurt:

  1. Air humidity level. During the cultivation of crops, you must carefully monitor the humidity of the air. If it is too high, then ideal conditions will be created for the development of greenhouse cucumber disease. Too humid air can damage fruits, stems and the root system of plants.
  2. Failure to comply with agrotechnical requirements during cultivation.
  3. Incorrect crop rotation. Often, inexperienced gardeners will plant cucumbers in the same place for several years. Also, the planting of bushes in areas where plants incompatible with cucumbers previously grew can be attributed to violations of crop rotation.
  4. Bad light. Sometimes greenhouses are installed in places with insufficient sunlight. For cultivation, it is recommended to choose areas that are well lit by the sun.
  5. Lack of useful trace elements and complete depletion of the soil. In order for the soil to always contain a sufficient amount of nutrients, it is necessary to periodically feed it. Such feeding consists of vitamin, mineral and other useful elements that young bushes need.
  6. Improper watering. You need to water the bushes very carefully so that water does not fall on the leaves.
  7. Late detection of diseased seedlings. It is recommended to regularly inspect the bushes to check if they have diseases and pests of cucumbers. If the disease is not detected in time at the initial stage of development, then it will eventually move to the rest of the bushes.
  8. Improper ventilation. The greenhouse must be ventilated periodically. However, this must be done carefully so that there is no strong draft.
  9. Contaminated greenhouse.The greenhouse should be periodically cleaned of fallen cucumber leaves, as various diseases develop in them.

cucumber leaves 0 turned yellow

Powdery mildew

One of the most common diseases that cucumbers suffer from is powdery mildew.


When this disease occurs, spots appear on the leaves of cucumbers in the greenhouse. Over time, they can spread to the stems. The spots are grayish or white and therefore outwardly resemble scattered flour.

If you do not get rid of powdery mildew in a timely manner, then the spots will spread throughout the plant. This will lead to the cessation of fruit emergence, drying of the leaves and death of the plant.

The reasons

The main reason why this disease appears is the wrong temperature regime. The disease occurs at low temperatures during cool and cloudy weather. If the air temperature is raised to 25-30 degrees, then the spores will be destroyed. Also, the disease can appear if fertilizers that contain a lot of nitrogen are often applied to the soil.


In order not to waste time on treating cucumber leaf disease in the future, it is necessary to figure out how to protect cucumbers from it. For prevention it is necessary:

  • water the bushes with warm water several times a week;
  • monitor the beds with cucumbers - periodically weed them, remove weeds and crumbling dry leaves;
  • cover the bushes with plastic or close the greenhouse to raise the temperature in it;
  • cultivate only those varieties that are resistant to powdery mildew.


Some people don't know how to deal with this disease. You can cure powdery mildew with folk remedies. To do this, you need to spray the bushes with mullein solution. To make a solution, one kilogram of the substance is poured into 3-5 liters of water and infused for 5 days. Then the infusion is passed through cheesecloth and again filled with 5 liters of clean water.

powdery mildew on cucumbers

If there is no mullein, you can use sour milk. To do this, it is mixed with boiled water in a one-to-one ratio. Spray cucumbers with such a solution no more than once a week.

You can also get rid of powdery mildew with a soda solution. During its preparation, 100 g of the substance is mixed with 100 g of laundry soap and a liter of water. You need to use the prepared product every week.


The disease can appear on bushes of any age. In this case, not only plants growing in greenhouses suffer, but also in open ground.


Signs of the disease appear almost immediately after its onset. Spots appear on the cucumbers in the greenhouse, their leaves turn light yellow. After a few days, they begin to change their color and acquire a brown tint. It is imperative to treat the disease, since its further development will lead to the drying out of all the leaves and the death of the cucumber bush.

The reasons

Peronosporosis is caused by fungi that are common in greenhouses. They develop due to too humid air. Also, the fungus can appear if you often water the bushes with cold water.


To protect cucumbers in a greenhouse from diseases and peronosporosis, you must adhere to certain rules:

  • do not water the young bushes of the plant with very cold water;
  • do not thicken the planting and plant seedlings less often;
  • timely harvesting of fruits;
  • disinfect seeds before planting them in the ground;
  • remove plant debris from the site, as spores of cucumber diseases can develop in them.

peronosporosis of cucumbers


For the treatment of peronosporosis, folk remedies for cucumber diseases are used. An effective remedy that will help get rid of peronosporosis is milk whey. You need to process the bushes with liquid several times a week.

Fungal diseases do not tolerate copper well, so you can get rid of peronosporosis with the help of Bordeaux liquid. To prepare it yourself, you should mix 100 grams of lime and copper sulfate with a soapy solution. It is recommended to use Bordeaux liquid once a week until the plants are completely healed.


Brown spot is quite common in adult bushes and affects their leaves and fruits.


Cladosporia is a very dangerous disease that can spread to all bushes within one week. The first signs of the disease begin to appear on the stems and leaves. They become covered with brown spots, which eventually pass to the fruit. Diseased-grown cucumbers should not be eaten and should be collected and discarded immediately.

In order to get acquainted with the signs of the disease in more detail, you can examine a photo of leaves that are affected by cladosporium.

The reasons

The disease occurs and actively develops with serious temperature changes. Also, cladosporium disease can appear after watering the bushes with ice water. The disease begins to manifest itself at the final stage of the growing season, when the night temperature is much lower than the daytime.

Vegetable debris is another common cause of brown spots. Over time, they accumulate a huge amount of fungal spores, which are very dangerous for cucumbers.

cladosporiosis of cucumbers


Many people do not know what to do to protect bushes from infection with cladosporiosis. For the prevention of the disease it is necessary:

  • plant cucumber seedlings in well-lit greenhouses;
  • water the bushes only with heated and infused water;
  • regularly clean the beds from accumulated plant residues;
  • water the cucumbers at the root so that the liquid does not get on their leaves;
  • ventilate the greenhouse several times a week.


When the first signs of cladosporia are detected, it is necessary to stop watering the plants. If the temperature in the greenhouse is below 20 degrees Celsius, then it must be immediately raised. The fight against diseases of cucumbers and cladosporiosis consists in treating the bushes of the plant with Bordeaux liquid or preparations that contain copper. You can also use ash and lime with them.

The bushes should be treated with special sprayers, and not with an ordinary watering can.

Fusarium wilting

Not all varieties of cucumbers are resistant to fusarium, so many vegetable growers are often faced with this disease.


A plant can become infected with Fusarium at an early stage of its development, but the first signs will begin to appear only during the ripening of fruits or flowering. At first, the leaves located at the bottom of the bush will begin to fade gradually. Over time, wilting will spread to the upper leaves, which immediately turn yellow and change their shape.

Fusarium is confused with verticellosis, as these diseases have similar symptoms. To distinguish them, it is necessary to cut one bush and carefully examine the vessels of the stem. If the cucumbers get sick with fusarium, then they will be painted in a dark brown color. With verticellosis, the vessels are much lighter.

The reasons

To infect cucumbers with fusarium, a special pathogen is needed. Fungi may be present on the surface of inventory or found in the ground. They are also often present in the seedling medium and harvested seeds. There are several factors due to which Fusarium wilt appears:

  • insufficient amount of light in the greenhouse;
  • seedlings are planted too close to each other;
  • the soil contains a large amount of fertilizers containing nitrogen or chlorine;
  • greenhouse is installed near industrial production.

fusarium cucumber


For the prevention of fusarium, you need to soak cucumber seeds before planting.This is done with the help of a strong solution of potassium permanganate, heated to 70 degrees. Before planting, the seed is placed in this solution for 2-4 hours for disinfection.


Before spraying the bushes, you should figure out how to do it. Cucumber processing and treatment should be carried out with special means. The disease can be treated with biological drugs. Trichodermin is an effective remedy against fusarium.

It can be added to the seedling substrate. For each bush of seedlings, about 2 g of the drug is consumed. It can also be added to the soil at the rate of 1 kg per square meter of land.

In addition, you can get rid of this disease of cucumber seedlings with the help of Pseudobacterin-2. To prepare the mixture, 100 ml of the drug is mixed with a liter of water.

Gray rot

The disease spreads by contact and air during harvesting or when caring for bushes.


Gray rot is manifested by the spread of brown spots on the leaves of cucumbers. With high humidity, mold appears on cucumbers with fluffy gray spores, which are carried to the rest of the bushes by drafts.

gray rot on cucumbers

The reasons

The disease appears and begins to actively develop only under certain conditions. The most suitable environment for the appearance of gray rot is low temperature and waterlogging. Therefore, it is recommended to regularly monitor the humidity and temperature in the greenhouse.


To prevent the appearance of gray rot and protect cucumbers from diseases, you must:

  • properly care for the bushes and regularly spray them with special protective preparations;
  • plant cucumbers at a distance of at least 80 cm from each other;
  • be sure to spray the beds and greenhouse after harvesting;
  • observe crop rotation.


When the first symptoms of gray rot appear, it is recommended to stop watering the plants for 2-5 days. You should also ventilate the greenhouse and get rid of all affected leaves. For processing cucumber bushes, you can use ash or copper-chalk powder.

Root rot

Cucumbers can become infected with this disease at any stage of their development.


First, the disease spreads to the root system of cucumbers. The roots turn brown and begin to dry out. If you do not take up treatment in a timely manner, they will begin to die off. Then the disease affects the root collar and stem. They also begin to discolor and wilt.

The reasons

Root rot appears with severe temperature changes. Also, this disease of cucumbers can appear due to regular watering of the bushes with cold water or too deep planting of seedlings in the ground. It is recommended to immediately get rid of plant residues that have been infected with root rot, as they also spread the disease.

root rot on cucumbers


Protection of greenhouse cucumbers from diseases and pests is as follows:

  • watering cucumber seedlings with heated water;
  • periodically adjust the temperature in the greenhouse in order to avoid serious changes;
  • do not plant cucumbers in areas where there was root rot.


If signs of root rot have been identified, it is necessary:

  • shake off the soil from the bushes;
  • fertilize plant roots with manure and special disinfectants (you can prepare a solution of 5 tablespoons of ash mixed with a liter of water and a teaspoon of copper sulfate);
  • sprinkle the stems of the bushes with chalk or ash;
  • dig up infected seedlings and burn.


A fairly common disease that appears when growing cucumbers in greenhouses.


During anthracnose, brown spots appear on the plant. Within a few days, the leaves will begin to turn yellow, and wet sores will appear on the cucumbers. Therefore, it is not so difficult to recognize this disease.

cucumber anthracnose

The reasons

Most often, the plant becomes infected with copperhead due to diseased seeds that were previously collected from the bushes.Also, the disease can appear due to the fungus found in plant debris or the upper layer of the soil. In addition, anthracnose can spread quickly due to temperature changes and frequent watering with ice water.


To prevent the disease, you must not forget about the correct crop rotation, therefore, you need to plant cucumbers in their original place only after 3-4 years. You should also periodically clean the greenhouse of plant residues that accumulate during the cultivation of cucumbers.


Before processing cucumbers, you need to figure out what to use for this. To get rid of anthracnose, you need to spray them weekly with a mild Bordeaux mixture. Instead, you can use a 0.5% solution of copper sulfate or a mixture of coal and lime. Treatment of cucumbers for diseases should be carried out in the evening after watering.


There are quite a few different diseases in cucumbers. To prevent their appearance, you need to familiarize yourself with how to prevent cucumber diseases in a greenhouse.

  1. Elizabeth
    7.07.2019 18:45

    Cucumbers cannot be processed with Bordeaux liquid during fruiting!

    To answer
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