Disease is one of the important factors affecting potato yield and species in winter. Now the major diseases and prevention methods of potato in winter in Yunnan Province are described as follows:

Virus disease prevention and control methods: the use of anti-virus varieties and virus-free seed potato; removal of field disease; timely control of aphids.

One of the fungal diseases is late blight. Control methods: selection of disease-resistant varieties and disease-free seed potatoes; timely removal of central diseased plants and cultivator weeding; chemical control. The second is early blight. Control methods: selection of disease-resistant varieties; chemical control.

Bacterial diseases and control methods for ring rot: selection of disease-resistant varieties and disease-free seed potatoes; timely removal of the diseased plants; implementation of crop rotation, pay attention to the prevention and control of underground pests. Bacterial wilt control methods: Agricultural control is mainly: a reasonable rotation. Selection of disease-free and disease-resistant varieties to prevent diseased potatoes from mixing into fertilizers, increasing phosphorus and potash fertilizers, removing weeds from the field, and finding that the central diseased plants are removed in a timely manner. The diseased point is disinfected with lime and promptly drained in a low-lying manner: 50% urinary rubber fertilizer is used. Acid copper WP 500 times or 14% Ammonia Bronze Aqueous Solution 400 times Irrigation, every 7 to 10 days irrigation, continuous irrigation 2 to 3 times. Soft rot control methods; Agricultural control measures include strengthening cultivators before harvesting, paying attention to field drainage; mature tubers are protected from manual and mechanical damage during harvest and shipment. Black cockroach control can be used for enemy pine 7.5kg/hm2 or 400 grams of the disease grams net liquid dressing, or foliar spray 0.1% copper sulfate solution. 18% mancozeb dust can be used to treat the scab and it can be used to treat the seed potatoes or fumigate the soil, or soak in the unwarmed formalin 200 to 250 times for 20 to 30 minutes, and remove the stuffy water for 6 to 8 hours after soaking.

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