How to effectively control potato late blight?

How to effectively control potato late blight? Effective control of potato late blight can be carried out from the following points: 1. Agricultural control: ① Choose disease-resistant varieties, plant reasonably closely, apply fertilizer according to formula, increase potassium fertilizer, and enhance plant resistance. (2) Strictly select disease-free seed potatoes to eliminate the infection sources of diseases.③ high ridge cultivation, drainage and moisture reduction. Strengthen cultivation management. Early sowing at appropriate time, selecting loose soil and good drainage fields to promote healthy growth of plants and enhance disease resistance.④ Disinfect seed potatoes. After seed potatoes are spread, 5g 58% metalaxyl manganese zinc wettable powder can be mixed with 2.5kg water to spray seed potatoes evenly. After drying in the shade, seeds can be sown. Second, chemical control: late blight epidemic is strong, in the control strategy should be based on early control, occurrence of disease conditions, it is necessary to spray prevention in advance. the medicament selects 500 times of 25% metalaxyl wettable powder, or 500 - 600 times of 58% metalaxyl manganese zinc wettable powder, or 300 times of 40% aluminum triethyl phosphate wettable powder, or 800 times of 70% mancozeb wettable powder, or 500 times of 50% chlorothalene wettable powder, or 500 times of 50% chlorothalate wettable powder, or 500 times of 64% toxoalum wettable powder, or 60% succinates·ethyl phosphine aluminum wettable powder 500 times solution, or 72% Kelu wettable powder 700~800 times solution, or 69% Anke·manganese zinc wettable powder 1000 times solution, or 72.2% propamocarb aqueous solution 800 times solution, or 1∶1∶200 times Bordeaux mixture. Spray once every 7~10 days, spray 2~3 times. In order to slow down the emergence of resistance, attention should be paid to the rotation of drugs. Click for more potato growing techniques Click for more vegetable growing techniques