(1) Selection of disease-resistant varieties Disease resistance varieties currently promoted include: Hubei Potato No.1, No.2, Damba No.10, Shuzhang Potato No.3, No.24 Center, I-1085, and Dwarf 88—1-99. Potato 161-2, Zhengshu No. 4, Yifang No. 1, Victory No. 1, Sijin Huang, Deyou No. 1, Tongshu No. 8, Kexin No. 4, Xinyi No. 4, Ummun 601, Wensheng 2 No. 3, Qinghai, etc. These varieties were less affected in the epidemic year of late blight, and they could be selected locally according to local conditions. (2) Use disease-free seed potatoes to reduce the initial infection source. In the process of autumn harvest pits, winter pits, cellar pits, depots, vernalization, etc., the diseased potatoes must be strictly removed each time, and disease-free seeding areas must be established to survive disease-free seeding. (3) Strengthen the cultivation and management, timely sowing, selection of loose soil and well-drained fields for planting, reduce the humidity in the field, promote robust growth of plants, and enhance disease resistance. (4) At the beginning of onset, spray 72% Kelu or Keshuang Cyanide or Frosty Ba wettable powder 700 times or 69% Anke Manganese zinc wettable powder 900 to 1000 times liquid, 90% triethylphosphonate aluminum wettable powder 400 times liquid, 38% cholera or 64% antivirus WP 500 times, 60% saponin aluminum phosphorus wettable powder 500 times, 50% methyl cream wettable powder 700 ~ 800 times liquid, 4 % pyrimidine nucleoside antibiotic agent 800 times liquid, 1:1:200 times Bordeaux mixture, every 7 to 10 days 1 time, continuous control 2 to 3 times.

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