Tomato leaf spot mainly damages leaves and fruits. At the beginning of the disease, the leaves are covered with dark round or irregular round spots, and the posterior edges of the leaf veins expand in an irregular manner. The middle part gradually fades from gray to gray brown. The lesions are slightly concave, many are smaller, and are extremely thin. Easily broken, pierced or peeled off. Infestation of the fruit produces a large round depression spot, with a white hair that grows white, then turns brown and eventually black, causing fruit decay.
Control methods: Strengthen field management, increase application of bio-organic compound fertilizers and phosphorus and potassium fertilizers, and spray foliar fertilizers to increase their resistance to disease; at the beginning of the disease, spray 52% fasting water purification agent 1800 times or 68% Water-retaining agent 1300 times, 47% Garethon WP 700 times, 75% chlorothalonil wettable powder 600 times, 7-10 days, continuous control 2-3 times.
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