prevention and treatment of downy mildew: 6 times solution of 75% chlorothalonil wettable powder and 1 times solution of 77% kocide wettable powder were alternately used for prevention before the onset. At the initial stage of the disease, 6 times solution of 58% metalaxyl manganese zinc wettable powder, 8 times solution of 47% Garenon wettable powder and 8 times solution of 72.2% prochloraz soluble solution were used for timely prevention and treatment, once every 7 days for 2~3 times in a row.
powdery mildew control method: at the initial stage of the disease, 15 times of 15% triadimefon wettable powder, 6 times of 62.25% Xiansheng wettable powder and 1-15 times of 1% Shigaoshui dispersible granules are alternately controlled once every 7-1 days for 2-3 times in a row.
prevention and control methods of bacterial angular leaf spot: at the initial stage of the disease, 3~4 times of 72% agricultural streptomycin, 6~7 times of 77% kocide wettable powder and 5~6 times of 2% thiabendazole were alternately prevented and controlled once every 7 days for 3~4 times in a row.
control method of stem blight: at the initial stage of the disease, 6-8 times of 7% thiophanate methyl wettable powder, 6 times of 75% chlorothalonil wettable powder and 5 times of 7% mancozeb wettable powder were used alternately, once every 5-7 days for 3-4 consecutive times. You can also mix 5% thiophanate methyl and 5% antivirus alum into paste and apply it to the affected part with a brush, with good results.