Soybean gray spot disease is an intermittent epidemic. In recent years, due to the increase in the area of ​​soya bean cultivars, the occurrence of gray leaf spot disease has become more and more serious. Generally, annual occurrence of soybean production can reduce production by 12%-15%, and in severe years, it can reduce production by 30%.

The disease mainly damages the leaves and also invades the stems, pods and seeds. Seedlings growing from diseased seeds showed semicircular dark brown depressions on the cotyledons. When the plants were cold and rainy, the disease spread to the growing point and the diseased seedlings died. Adult plant leaves begin to appear chlorotic small round spots at the beginning of disease, gradually form the middle gray to gray brown, surrounded by brown frog eye spots, size 2-5 mm, some lesions are oval or irregular shape, humidity, leaves In the middle of the lesions on the back, a dense layer of gray mold was developed. The diseased spots covered the entire leaf, and the fusion or diseased leaves were dry. The lesions on the stems produce oval lesions with a brown center and reddish-brown edges with fine dark spots. The lesions are round or elliptic on the lesions, gray on the center and red-brown on the edges. The lesions were round or irregular on the bean, dark brown on the edges, gray on the center, and the mold layer on the lesion was not obvious.

Prevention of soybean gray spot disease can take the following measures: 1 to strengthen field management, timely removal of diseased seedlings onset, can effectively control the incidence. 2 chemical control. Leaf can be sprayed with 36% carbendazim suspension 500 times, or 40% chlorothalonil suspension 600 times, or 50% thiophanate-methyl wettable powder 600-700 times, or 50% benomyl Ling WP 1500 times, or 65% Triamcinolone WP 1000 times spray control, spray about 10 days 1 time, spray 1-2 times. 3 Deeply divert land in time after harvest.

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