Treatment of cucumber diseases in a greenhouse

In the warmth of the film shelter, not only vegetable crops, but harmful microorganisms grow well and develop. Diseases of cucumbers in the greenhouse develop quite rapidly, and in a confined space, the pathogen quickly spreads to healthy plants.

Treatment of cucumber diseases in a greenhouse

It is best to carry out preventive treatment of beds. But if the plants are already sick, then you will have to resort to the help of specialized drugs. They help in growing and allow you to more effectively deal with pests and pathogens.

What sick cucumbers in the greenhouse

In order to win in the fight against diseases of cucumbers in the greenhouse, you need to know as much as possible about their pathogens. An experienced gardener can at first glance determine what exactly the plants are sick with and will quickly pick up than to treat them. Beginners can not cope with this task without outside help. Since most diseases are caused by a fungus, their symptoms are very similar.


The main enemy of greenhouse cucumbers is rot. It affects not only the fruits and leaves, but also the roots. The causative agents of this disease are mold fungi. The reasons for the development of rot quite a lot. First of all, the plant is affected by ventilation disorders in the greenhouse, as well as excessive humidity.

Spores of the fungus do not come from anywhere, they are brought into the soil along with seeds, diseased seedlings, humus, etc. No one is immune from this, but a number of measures can be taken to disinfect the soil. The best option is to sow mustard seeds as siderates, as well as soil disinfection using specialized preparations.

There are several types of rot:

  1. White rot - the leaves and stems of the plant are covered with white coating and soften over time. Fruits when rotting exude a terrible smell and become like frostbitten.
  2. Gray rot - light gray spots on leaves and fruits. The foci of the disease resemble velvet in texture. This is nothing more than the "flowering" of the fungus. His disputes so extend to healthy specimens.
  3. Root rot - brown plaque in the root zone of the stem. Leaves begin to turn yellow and dry quickly. The lesion site is very thin, and then rot away. The stalk can crack very much from the disease.
  4. Black stem rot or ascochitosis - looks like round spots of brown, and later black. They spread along the inner surface of the leaves, and sometimes affect the stems. The plant quickly fades and dies from this ailment.

If the distance between the bushes is too small, the air will circulate poorly and fungal rot may develop. For this reason, it is not recommended to thicken plantings.

Fungal diseases

In addition to rot, spores of fungal mold can cause quite serious diseases. They can not only reduce the yield of cucumbers, but also destroy all plantings.

There are several types of diseases of greenhouse cucumbers:

  1. Powdery mildew - leaves and fruits are covered with dense gray-white plaques. Over time, the affected areas dry out and fall off. Such a disease causes enormous damage to the household, leading to the death of the entire crop. Fruits affected by powdery mildew can be eaten, previously peeled, but for conservation they are not suitable.
  2. Pecronosporosis or downy mildew - is manifested by faded yellow spots, which are constantly growing in size. The affected leaves will be burned, and after the pathogen affects the shoots themselves.
  3. Anthracnose - characterized by the presence of holes on the leaves. The disease affects the plant with foci, and in this place, a bulge first forms, and then a slit-like opening. Indented sluggish areas appear on the fruits themselves.

The danger of fungal diseases lies in the fact that their spores do not disappear, but remain in the ground for many years. In the future, they affect the plant that will be planted in the greenhouse. For the same reason, it is not recommended to plant cucumbers on the same bed for several years in a row.


Sick cucumber should be removed with the root and burn

It is also worth mentioning another dangerous disease. Bacteriosis is also called angular spotting, it is caused by specific marks that are formed by young shoots. Small triangular black dots cover the entire surface of the cucumber.

One of the main consequences of bacteriosis is Zelentsy necrosis. A black, dried area forms in the core of the fetus. So you can lose from 50 to 80% of the crop.

The disease quickly spreads to healthy specimens. In order for the pathogen to not be able to infect them, the sick cucumber is removed from the garden along with the root. After the plant, it is recommended to burn.


In addition to various diseases, planting can spoil pests. Most often, the tops are attacked by aphids, from this it withers and turns yellow. Zelentsy on such a plant is either not tied, or grow crooked and bitter.

A spider mite can also kill cucumbers. These little creatures breed fairly quickly. By the time a thin white cobweb is visible on the plant, the colony of ticks will reach a huge size.

Hothouse Whitefly got its unusual name for a reason. It feels good in conditions of high humidity, unlike previous pests. In order to make a beautiful butterfly of white color from an inconspicuous caterpillar, the insect needs to eat up to 3 kg of green mass. She sucks all the juices from the stems and leaves of the plant, after which it dies.

How to treat cucumbers

Diseases of cucumbers in the greenhouse and their treatment need special attention from the gardener. You can not let them drift, otherwise there is a great chance to lose all plantings and crops. In addition, pathogens can affect other crops that grow nearby.

To combat the diseases of cucumbers in the greenhouse and their consequences, it is necessary to treat the plants with special preparations. They are sold in any store selling seeds and related products for the garden.

The fight against rot begins with the removal of the affected areas of the shoot. If we are talking about root rot, then the shoots of cucumbers are exposed from the leaves 10-15 cm from the ground. Then, 3 tablespoons of copper chloride are diluted in 0.5 l of water, and all bushes are sprayed with this solution. It is also recommended to sprinkle them with wood ash. With black stem rot, plants need to be treated with a powder of copper and chalk.

The treatment of fungal diseases and bacteriosis is recommended with fungicides. They come in organic and inorganic origin. What kind of drug to process their beds only the gardener chooses. The market offers a huge assortment of drugs. Some of them poison the soil by accumulating in it. Organic fungicides do not pollute the environment.

Folk remedies

For the treatment of plants, you can use infusions

There is an alternative treatment for greenhouse cucumbers. These secrets came to us from our ancestors, who did not have at their disposal chemical preparations.

Aphids are treated with a solution of serum and laundry soap. To do this, just foam it. After the procedure, wet leaves can be dusted with a mixture of wood ash and chalk. To scare away the greenhouse whiteflies, they insist onion husks for a day and then spray the plants with this infusion.

Powdery mildew is also commonly treated with serum. In 1 liter of fermented milk product, add 1 tablespoon of honey and spray the shoots. In the same way, you can do with any fungal disease. Processed with this solution and downy mildew.

Processing Rules

When working with fungicides, you must adhere to strict personal safety rules. They have a toxic effect when accumulated in the body. Even couples rising when spraying plantings are poisonous. Contact with skin or mucous membranes threatens with severe allergic reactions.

For this reason, when working with fungicides, you need:

  • wear closed clothing;
  • use a respirator and goggles;
  • wash hands and face with soap after finishing work;
  • wash clothes at high temperature.

The toxicity of the drug should be kept away from direct sunlight, as well as children. It is not necessary to carry out processing on a hot afternoon or rainy day.


In order not to waste time on the treatment of cucumbers, summer residents choose varieties resistant to disease. This does not give a 100% guarantee, but significantly reduces the likelihood that the culture will not be affected by disease.

These varieties are no different from their counterparts, the only difference between them is that they suffer less from diseases.

In the cultivation of cucumbers, an important role is played by prevention. In order to grow a good crop of cucumbers, you need to follow them. There are a number of rules that are very important:

  • humidity in the greenhouse should be no more than 80%;
  • the presence of good ventilation and exhaust;
  • timely removal of diseased shoots;
  • soil mulching;
  • loosening of soil after watering.

Particular attention should be paid to the choice of planting material. Seeds and seedlings may already be infected. Before planting, seeds are poured with boiling water to disinfect, they are also treated with a weak solution of potassium permanganate.


Treating plants is much more difficult than preventing the disease itself. Therefore, all efforts at the beginning of the growing season of culture should be put on the prevention of illness.

In the cultivation of cucumbers, you can achieve high results if you adhere to certain rules for planting, watering, care and feeding the plant. But even perfect care cannot but guarantee the development of the disease, as well as the absence of pests in the greenhouse.


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