The old Chinese medicine health care manager will answer for you: grape brown spot disease is also called spot disease, brown spot disease, leaf spot disease and angular spot disease. There are two kinds of brown spot disease: brown spot disease and small brown spot disease, which mainly harm the middle and lower leaves. Brown spot disease with a diameter of 3- 10 mm is brown spot disease, and its symptoms vary with species or varieties:

The health care manager of the old Chinese doctor suggested that the method of preventing and treating macula should be:

(1) Strengthen vineyard management. Remove fallen leaves, burn them centrally or bury them deeply to reduce the source of overwintering bacteria. Pay attention to drainage during the grape growing period, appropriately increase the application of organic fertilizer, enhance the tree vigor, improve the plant disease resistance, and remove the lower yellow leaves and diseased leaves in the middle and late growth period to facilitate ventilation and light transmission and reduce humidity.

(2) Spray protection. Combined with other diseases at the early stage of the disease, spraying 1: 0.7: 200 times Bordeaux solution or 400-500 times solution of 30% Ludebao suspension, 500-600 times solution of 70% mancozeb wettable powder, 600-700 times solution of 75% chlorothalonil wettable powder and 800 times solution of 50% thiophanate-methyl suspension. Because the disease starts from the lower leaves of the plant and then spreads upwards, we should pay attention to the lower leaves of the plant, both before and after.

I hope it helps you.

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