How can potato late blight be controlled effectively?
How can potato late blight be controlled effectively? Please provide guidance. Effective control of potato late blight can be carried out in the following ways: 1. Agricultural control: ① Select disease-resistant varieties, plant at a reasonable density, use balanced fertilization, increase potassium fertilizer, and enhance plant resistance. ② Strictly select disease-free seed potatoes to eliminate sources of disease infection. ③ High...
How can potato late blight be controlled effectively? Please provide guidance.
Effective control of potato late blight can be carried out in the following ways:
1. Agricultural control: ① Select disease-resistant varieties, plant at a reasonable density, use balanced fertilization, increase potassium fertilizer, and enhance plant resistance. ② Strictly select disease-free seed potatoes to eliminate sources of disease infection. ③ Cultivate on high ridges to improve drainage and reduce humidity. Strengthen cultivation management. Sow early at the appropriate time, choose fields with loose soil and good drainage, and promote vigorous plant growth to enhance disease resistance. ④ Disinfect seed potatoes: after spreading the seed potatoes out, for each mu of seed potatoes, use 5 g of 58% metalaxyl-mancozeb wettable powder mixed with 2.5 kg of water and spray evenly over the seed potatoes; once dry in the shade, they can be planted.
2. Chemical control: Late blight is highly epidemic, so the control strategy should focus on early prevention. When conditions for disease development appear, spray preventively in advance. Choose 25% metalaxyl wettable powder at 500 times dilution, or 58% metalaxyl·mancozeb wettable powder at 500-600 times dilution, or 40% fosetyl-aluminium wettable powder at 300 times dilution, or 70% mancozeb wettable powder at 800 times dilution, or 50% anilazine wettable powder at 500 times dilution, or 50% thiram wettable powder at 500 times dilution, or 64% oxadixyl·mancozeb wettable powder at 500 times dilution, or 60% bismerthiazol·fosetyl-aluminium wettable powder at 500 times dilution, or 72% cymoxanil wettable powder at 700-800 times dilution, or 69% dimethomorph·mancozeb wettable powder at 1000 times dilution, or 72.2% propamocarb aqueous solution at 800 times dilution, or Bordeaux mixture at 1:1:200. Spray once every 7-10 days, and 2-3 sprays are sufficient. To slow the development of resistance, pay attention to rotating the chemicals used.
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