Convolvulus brown spot can harm sweetpotato
Control methods:
1 Select resistant varieties;
2 Seedlings from disease-free plants are soaked in warm water at 48 degrees Celsius for 30 minutes before seeding;
3 pay attention to field drainage, plant ventilation;
4 In the initial stage of the disease, spray 58% of methyl frost wettable powder 600-700 times, or 64% of antimony wettable powder 500 times, 50% of methyl frost wettable powder 600-700 times, or 40% of ethyl phosphorus Al wettable powder 250-200 times, or 72.2% Preclo 800-1000 times, or 75% chlorothalonil wettable powder 500-600 times, spray every 7-10 days, continuous Spray 2-3 times.
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