1, choose resistant varieties. The resistance of different varieties of potato to late blight is very different because the potato late blight bacteria are prone to variability and vertical disease resistance (cultivates against certain races of a pathogen but not other races) is planted for several years. After that, it is easy to lose its disease resistance, so species with a level of disease resistance (disease resistance is generally consistent with all races of pathogens) should be selected. 2, use disease-free seed potatoes. Strict implementation of various control measures, in the light of the incidence of land, choose the disease-free plant seed potatoes left. 3, seed processing. Soaking with a systemic fungicide, such as 50% carbendazim 500 times soaking, can also be used 200 times formalin solution soaking. Then piled up and covered tightly, boring for 2 hours, then spread out to dry. 4, strengthen the cultivation and management. Select seed potatoes before sowing and eliminate the contaminated tubers can reduce the number of diseased plants in the field. In the late growth period of potato cultivation, the chance of zoosporangium invading the potato can be reduced. 5, pharmaceutical control. When the central diseased plant appeared in the field, the central diseased plant was immediately removed, and 1%-2% copper sulfate solution was sprayed. The spray was sprayed every 7 days and sprayed 2-3 times successively.
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