Potato late blight is a major disease in potato production. It is a typical epidemic disease caused by fungi. Reinfection can occur many times in a growing season. When the disease occurs seriously, the plants will die early and the yield loss can reach as high as 20%~40%, or even no income.
The disease mainly affects leaves, stems and tubers. When the leaves are infected, water-soaked green-brown spots will appear on the tip or edge of the leaves first, with light green halos around the spots. When the humidity is high, the spots will expand rapidly and turn brown, and produce a circle of white mold, that is, cyst stems and The sporangia, especially on the back of the leaves, are the most obvious. When dry, the lesions turn brown and dry, brittle and easy to crack, no white mold, and the expansion speed slows down. Infected stems or petioles show brown streaks. Severely affected leaves shrivel and shrink, eventually causing the whole plant to black rot, and the whole field is scorched, giving off a rotten smell. When the tuber is infected, the first-born brown or purple-brown large lesions are slightly sunken, and the potato flesh under the skin of the diseased part is also brown, and slowly expands or rots around.
During the rainy season, the humidity in the field is high, which is conducive to the occurrence of late blight. According to the investigation by the technicians of the plant protection station, the diseased field rate is 13.4%, and the average diseased plant rate in the occurred field is 6.7%.
Adhere to the strategy of "prevention first, comprehensive prevention and control", and apply the medicine before the infection of late blight bacteria or at the initial stage of the disease, and spray the medicine for the first time during the budding period, and spray it in advance or later according to the weather and disease conditions.
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