1. Seed dressing or dressing. 2. Add potassium sulfate, potassium chloride and other potash fertilizers. 3. Potash irrigation root control. The rate of diseased plants is more than 10%, 3 to 5 kg of potassium chloride in mu, or 50 kg of vegetation ash. Diseased plant rate in 10% to 20%, 8 to 10 kilograms of potassium chloride, or 80 to 100 kilograms of plant ash. The rate of diseased plants is more than 30%, and 10 to 15 kg of potassium chloride in mu, or 100 to 150 kg of vegetation ash. 4. Chemical control. Use 40% root roticide 600 times solution or 50% carbendazim + 40% ethane phosphonium aluminum 1000 times solution or 70% thiophanate methyl solution + 40% aluminum phosphonium aluminum solution 1000 times, 100 grams of liquid per plant .
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