The prevention and cure technology of grape gray mold
To control botrytis cinerea, we must adhere to the plant protection policy of “prevention as the mainstay and comprehensive prevention and controlâ€, and we must earnestly do the following:
The first is the selection of disease-resistant varieties. Different grape varieties have different resistance to gray mold. For example, varieties such as black ham and black granules are highly resistant, while cultivars such as Kyoho, New Rose, Victory, White Rose, and Red Grape are less resistant. All localities should choose disease-resistant varieties as far as possible according to local conditions.
The second is to clean the vineyards. In autumn and winter, the debris, dead fruits and other debris were completely removed and burned. During the flowering period of grape, when the dew is not yet dry in the morning, check the flower spikes and reduce the bacteria source and the disease center.
The third is to strengthen the cultivation and management. Increase the application of organic fertilizers and phosphorus and potassium fertilizers, and cultivate grape gardens to control the amount of nitrogen fertilizers to prevent leg shoots from becoming long; reasonable distribution of branches, ventilation and light transmission, reduce the humidity of orchards, and control the occurrence of diseases.
The fourth is rational drug use. 1 Grasp the peak of the two epidemics. In the germination stage, 3~5 Be lime sulfur can be sprayed once; before spraying and after flowering, it can spray pesticides twice; when the fruit is colored to mature stage, pesticide can be sprayed continuously for 2 to 3 times. 2 emphasis on pre-harvest control. In order to prevent the occurrence of botrytis cinerea during storage, spray 1% Tecdo WP 1 000 times in the ear before harvesting, air dry and then harvest. During storage, packaging with paper treated with sulfur dioxide and potassium sulfide can effectively prevent the occurrence of gray mold during storage. 3 kinds of pesticides are used interchangeably. Pesticides controlling botrytis: 50% carbendazim 500-fold, 70% thiophanate-methyl 800-fold, fast-acting 1 000-1500 times, 10% polyoxin 800-fold, 20% Pyrimethanil 800 to 1 000 times, DuPont EPC 1 000 to 1 500 times, 50% Benzene 2 000 times and so on. The alternate use of multiple agents can reduce the resistance of pathogens.
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