Control measures of Grape Botrytis cinerea

Grape Botrytis cinerea, commonly known as rotten flower ear, is a serious disease in the world, which may occur during the growth and storage of all grapes. Among the grape diseases, it causes the most serious losses, so what is the symptom of grape gray mold? How to prevent and cure it? Let's take a look.

1. Symptoms

Grape Botrytis cinerea harms inflorescences and fruits, and also harms leaves and shoots. In the case of many inflorescences, the disease occurs before flowering. At the initial stage, the inflorescence is as dark brown as it has been scalded by boiling water, the diseased tissue is soft rotten, the surface is dense with gray mold layer, and the injured inflorescence wilts. Young fruit is very easy to fall off. After the fruit stem is infected, black sclerotia will be produced on the disease spot; when the fruit is infected when it is ripe, it will first produce a light brown spot, which will soon spread to the whole fruit, making the fruit rot. When the disease is serious, the new shoot leaves will also be infected, resulting in irregular brown disease spots, and sometimes irregular wheel spots, which will be infected by bacteria during the storage period, and the fruit will also change color and rot.

2. Occurrence regularity

The disease is generally divided into two times, once before and after flowering, and the second time in the fruit ripening period, when the temperature is lower and the air humidity is higher in spring, Rain Water will cause the flesh of the fruit to crack, and the bacteria will take advantage of the deficiency, leading to fruit rot. The onset temperature of Botrytis cinerea is 20 degrees. Note that the air humidity is more than 85%. If the air humidity reaches more than 90%, the disease will be extremely serious. Therefore, the rainy season in spring is the onset period of Botrytis cinerea. In addition, improper management of Botrytis cinerea, such as poor ventilation, lack of light, low-lying terrain, excessive application of trace elements and so on, will lead to Botrytis cinerea.

3. prevention and control measures

First of all, we should select varieties with strong disease resistance, control nitrogen fertilizer when growing, spray paclobutrazol to inhibit new shoot growth and enhance disease resistance. In the critical period of prevention and control when spraying pesticides before flowering, 1000 times liquid of garlic oil can be sprayed to prevent, more prevention and control should be added to fertilizer and water, and trace elements should be supplemented appropriately. The weeds in the orchard should be cleared regularly, the orchard should be ventilated and transparent, the indoor temperature should be tested, the effect of disease control should be achieved, the soil quality should be guaranteed and the pests should be checked and killed.

The above is the introduction of grape gray mold prevention and control measures, hope to help you, want to know more related knowledge, please follow us.