Second, the symptoms of the onset of disease, the leaves, initially in the tip and leaf edges produce a round or irregular shape, dark green water spots lesions, expanded into a large brown lesions, humidity, disease, health at the junction there is a circle of white Mold layer. Injuries to the stems, resulting in a slight dingy brown streaks, when wet, produce white mold, damaged potato block, brown spots slightly sunken lesions.
Third, control methods (a) selection of disease-resistant varieties and disease-free seed potatoes.
(b) Serious disease fields and non-sweet potato vegetables should be cultivated for more than 3 years. Spring potato and tomato fields should be separated by 300-500 meters.
(3) Strengthen cultivation and management, rationally apply nitrogen and phosphate fertilizers, and increase potash fertilizer to enhance plant disease resistance. Drain the ditch, reduce the humidity in the field, remove the diseased plants in time, and burn them in a concentrated manner to reduce the incidence.
(d) Chemical control. At the early stage of the disease, spray immediately and control its spread. Spray once every 5 to 7 days, and spray 2 or 3 times. Commonly used drugs are 64% anti-virus 500 to 750 times, or 80% of large wettable powder 500 times (Jiangxi Agricultural University Agricultural College)
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