Grape rot is several types of infectious fungal diseases. Each of them has its own pathogens and causes.
Gray
The disease affects the entire green part of the grapes. First, on the vine, the leaves are covered with a brown-gray spot, which dries up under the sun's rays. Gray rot affects the berries, they receive less nutrition. Purple spots form on the berries. The peel becomes darker and bursts.
Black
Brown dry spots appear on the grapes. There are visible fungal formations on the foliage. Diseases are often exposed to young plants. Light brown depressions form quickly. After a few days, these grapes become shriveled. They turn blue and form seals with fungal spores.
The affected grape hangs on the bunch, causing the spread of the disease. If there is no treatment, then most of the crop can be destroyed by the fungus. Then the woody part dies. Even if one bunch is affected, it is better to remove the entire branch.
White
The causative agent may be in the soil. In spring, he moves to vine shoots. White rot fungus usually affects berries and shoots. The first signs are the appearance of small pink dots in dry weather. In wet weather, the dots turn black. Lesions become visible in a few hours.
Aspergillus
The disease is quite rare. But it can cause the death of the whole plant. The disease often appears at high levels of humidity and at high temperatures. Main signs: whitish spots on the berries, darkening with time. The grapes crack and become covered with a white bloom. Subsequently, it becomes dark brown.
Causes of rotting grapes
Reasons for posting:
- high humidity;
- improper watering;
- lack of light;
- lack of prevention.
A fungicide is suitable for treating rot. With gray rot, you can use Benleit, Euparen and Topsin. From black rot, preparations with copper are used - Bordeaux liquid, and for white rot, 2% Bordeaux liquid is suitable.
Prevention
It is necessary to choose a ventilated and illuminated place for planting grapes. Lowlands are best left for other crops. Mandatory preventive procedures consist of spraying with a fungicide. Regular inspections are carried out. Watering should be moderate and rare.
New plants are not planted in place of diseased bushes. Infected shoots and berries must be removed completely.
How do you deal with grape rot?
Read also: Gooseberries: the lifespan of a bush and when the plant begins to bear fruit
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