Soybean gray spot disease is an onset disease, which is caused by the infestation of C. sojae fungus. Both the yield and quality of soybeans are affected. Generally, the land yield is reduced by 10-15%, and the severely damaged land can be reduced by more than 30%. Gray leaf spot mainly damages the soybean leaves, and the lesions start to appear brown dots, and then gradually expand into round shapes with brown edges, gray or gray brown in the middle, diameters of 1-5 mm, and sometimes oval or irregular shapes. When the climate is humid, the surface of the lesion has a gray moldy layer. When the spotting is severe, the leaves are full of spots and merge to make the leaves dry. Control methods: 1, 50% carbendazim WP, 100 grams of acres; 2,40% carbendazim suspension, 100 grams of acres; 3,80% carbendazim ultrafine powder, 50-60 acres g; 4,70% thiophanate-methyl wettable powder, dosage of 80-100 grams. 5 40% Wei Wei Granule Suspension, 100 ml mu. The spraying time should be chosen from 6-10 o'clock in the sunny morning and from 3-7 o'clock in the afternoon.
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