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(1) Brown spot This is a leaf disease caused by a fungus in the fungus. The diseased leaves are yellowish-brown in a round or polygonal shape, and gray moldy leaves are produced on the leaves when wet. Severe onset in July-August. Prevention and control methods 1 Remove diseased leaves and reduce the source of pathogens. Spray 1:1:100 Bordeaux mixture. 2 Strengthen field management, increase organic fertilizer, and increase resistance to disease. 3 At the beginning of the disease, spray with 50% tumefa 600-800 dilution and spray once every 7-10 days for 2-3 consecutive times.