Diseases and pests of eggplant in the greenhouse

diseases and pests of eggplant in the greenhouse Blog

In an attempt to extend the eggplant season in the garden, many summer residents begin to grow them in greenhouse conditions. But in order to get a really worthwhile harvest of these vegetables, the summer resident should be aware of the problem areas of the plant that interfere with its development and fruiting.

The normal development of eggplant fruits in greenhouse conditions can be hindered by three main factors:

– improper care;

– fungal and viral diseases;

– Parasitic pests.

Each of these reasons has certain features, so they must be considered separately.

Wrong Care

Eggplant diseases in the greenhouse immediately manifest themselves with careless or unsuccessful agricultural practices.

yellowed leaves

This is a fairly common problem caused by improper agricultural practices and insufficient amounts of certain trace elements in the soil. So, with a small nitrogen component, the lower leaves of the plant turn yellow, and then crumble. If only the edges of the eggplant leaves turn yellow, this indicates a small amount of potassium.

eggplant diseases in the greenhouse photo

leaf curl

Leaf curl is caused by several factors:

– waterlogging of the soil;

– poor lighting;

– lack of trace elements;

– Insect pests.

eggplant diseases

It is easy to deal with the first two factors, here a small amount of microelements can be increased by urgent feeding. Phosphorus starvation is indicated by twisting the leaves up towards the stem. If they twist up with a boat, and at the same time a brown border forms on the edges, then the plant clearly lacks potassium.

The appearance of spots on the leaves

They can be caused by:

– parasites;

– Exposure to direct sunlight.

Important! Eggplants like constant watering only with warm water.

fungal viral infections

Among these eggplant diseases, the most common are:

– late blight;

– tobacco mosaic;

– black leg

– gray rot.

Phytophthora is the main enemy of eggplants. At first, she endows the eggplant leaves with brown spots, quickly turning to the stems, and then to the fruits. If preventive measures are not taken in a short time, the plant will die. The treatment is carried out by spraying with a 0.2% solution of copper sulphate or Bordeaux liquid, and the entire planting, and not just individual plants, should be treated.

diseases and pests of eggplant in the greenhouse
Late blight on eggplant

Tobacco mosaic is a viral disease in which the leaves first lighten, and then light or dark green spots form on them, which look like a mosaic. If not stopped in time, the disease leads to the death of the plant.

A folk remedy for the prevention of plant disease is a solution of laundry soap in skim milk (20 g of soap per 1 liter of milk). Spraying is done every 10-15 days, which dramatically reduces the risk of disease.

Important! If the plant has died, it must be pulled out and burned, and things that have come into contact with it must be disinfected.

The black leg is a constriction on the root collar, leading to gradual wilting, and then the death of the plant. Occurs with excessive planting density and waterlogging of the soil. The treatment is carried out by processing the drug “Trichodermin”, and if this does not help, then it should be eliminated.

Gray rot appears as dark water spots on the leaves. They tend to increase, gradually moving to the trunk and the vegetables themselves. The fight against the disease is carried out with a special preparation and fumigation of the soil.

Harmful living organisms

Eggplant pests in the greenhouse: spider mite, greenhouse whitefly, aphids, slug.


The spider mite settles on the inside of the leaves, feeding on cell sap. Reproducing rapidly, it can simply kill the plant. The fight against it is carried out with special preparations. Prevention is the disinfection of greenhouses and the thorough cleaning of particles of last year’s plants.

Aphids, like ticks, feed on plant sap not only on young seedlings, but also on fully fruiting bushes. Prevention is the observance of the ventilation regime, maintaining the desired temperature and humidity level in greenhouses.

eggplant diseases in the greenhouse spider mite
The spider mite settles on the inside of the leaves, feeding on cell sap.

The greenhouse whitefly poses a danger in the form of its larvae that feed on the juice of the plant, which contribute to the death of the leaves. The found larvae are collected or washed off with water, after which they themselves die.

The slug spoils both leaves and fruits, which harms the crop. As a preventive measure, the beds are treated with slaked lime, or a mixture with wood ash.

Important! Eggplant pests in the greenhouse are subject to destruction using modern chemicals, but they should be used strictly using instructions that prescribe the timing and dosage of drugs.

Problems in growing eggplant are easier to prevent than to try to cure them later. Preventive work should begin even with seeds, after which all agrotechnical practices for growing these plants should be observed.

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