The prevention of grape downy mildew

Grape downy mildew mainly damages leaves and shoots. Prevention: First, strengthen management. Cut off excess branches and shoots to improve ventilation and light transmission. When entering the rainy season in July, we should pay attention to drainage, reduce the humidity in the park, apply more phosphorus and potassium fertilizers, and increase the resistance of trees to disease. Second, eliminate the source of the disease. Remove diseased leaves and diseased shoots in time. Third, pharmaceutical control. Before the onset of illness, a small amount of protective agent, such as Bordeaux mixture, was sprayed once every 10 days for protection. After the onset of disease, spray 25% of thioredoxin 500 times, spray once every 10-15 days, or import Miconazole and other drugs, and use according to the instruction concentration.

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