Cucumber leaf blight not only damages stem vines, but also damages leaves and fruits. When the stem is attacked, it shows oily spots near the nodules, oval or prismatic, grayish white, slightly concave, secreting an amber fluid. When dry, the diseased part is shrunk longitudinally and a large number of small black spots are scattered on the surface. The lesions spread rapidly when wet, and the upper half of the plants wilted and died, and the diseased part rotted around the stem. The lesions on the leaves are nearly circular, sometimes "V"-shaped or semi-circular, pale brown to yellow-brown, with many small black spots on the lesions. The fruits were mostly infected by flower buds during the young period of melons, and the flesh was light brown and soft, showing heart rot.
Seed disinfection before seeding cucumber seedlings was controlled, and seed dressing was carried out using a 0.3% proportion of Baoning. Immediately after the onset of the disease, the following agents were sprayed to prevent and cure: 1, Chlorothalonil (40% suspension) 600-800 times. 2, thiophanate-methyl (70% wettable powder) 800-1200 times. All fields need to be sprayed and sprayed once every 4-5 days for 2-3 consecutive times.
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