2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Gray rot attacks young vine shoots with buds, and also often causes spotting of infected leaves. As a rule, it develops on grape bushes throughout the growing season and mainly affects weakened plants. This attack is also dangerous because it can affect berry plantings as part of a mixed infection or being disguised by other varieties of mushrooms. Therefore, it is extremely important to timely identify gray rot and direct all efforts to get rid of it as quickly as possible
A few words about the disease
On lignified annual shoots, destructive gray rot can easily cause discoloration of the bast and its rapid whitening. And grape leaves are rarely affected by it. Necrosis can form on them only with persistent high humidity. Usually they are located near the leaf veins and look like shapeless black spots, on which a gentle grayish coating of the causative agent of an unpleasant infection subsequently develops.
If gray rot covers the bushes during the flowering stage, the flowers turn brown and quickly fall off. And if this period is accompanied by the establishment of wet weather, then a rather unpleasant grayish bloom will begin to appear on them.
In case of damage to the ridges of grape bunches, the infected areas are painted in bright greenish-brownish shades. By the way, they often die off, which entails partial or complete abscission of the bunches. Especially often gray rot affects the vines after very windy weather, as a result of which they have received various damage. It is through such damage that the pathogen easily penetrates into plants.
The most harmful of the ill-fated disease is when the berries are affected, and it does not matter when this defeat occurs - during the ripening period of the berries or after the harvest is harvested. Almost always, berries damaged by the caterpillars of the grape leafworm are affected by gray rot. Berries with other damages are no exception. Initially attacked by gray rot, the berries are painted in grayish-brown tones. And when wet weather is established, they are covered with a rather thick grayish moldy bloom.
The causative agent of this destructive scourge is a fungus called Botrytis cinerea, which is capable of infecting some other plants, parasitizing them even after their death, and continuing to grow and develop on dead plant debris. On unimportantly ripe, as well as on dead areas of grapes, sclerotia are often formed. And in the spring, the pathogen begins to form numerous conidia.
Fungal mycelium overwinters both on the surface of the tree bark and inside it. It can often be found in the remains of grape ridges.
Since gray rot can easily be masked by other types of fungi, to detect it, a part of the plant is sent to a humid chamber (for several hours). And you can keep it for several hours in the refrigerator (at a temperature of two to five degrees). The growth of all other fungi in this case will be suppressed, and the pathogen of the ill-fated gray rot will begin to develop, forming a fluffy gray bloom.
How to fight
At the stage of advancing grape inflorescences, the plants are recommended to be treated with the drug "Horus" for prophylactic purposes, and at the stage of flowering the vineyards, along with this drug, are also treated with a drug called "Skor". The insecticide "Insegar" also helps to achieve a good effect - moreover, it perfectly protects the berry plantings from the bunchworm.
At the ripening stage of the berries, a couple of eradicating treatments with the "Switch" preparation are carried out - this fungicide helps to protect the berries from the development of a harmful misfortune. And before they begin to close in bunches, it is recommended to treat them with fungicides.
If gray rot has attacked grape ridges and berries, the preparations "Rovral" and "Ronilan" will help to successfully overcome it.
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