1: Symptoms of the disease: The leaves are infected, and the water-soaked dark green spots are first formed at the tip or leaf edge. There is a light green halo around the lesion. When the humidity is high, the lesion is rapidly enlarged, brown, and produces a circle of white mold, especially the back of the leaf is most obvious. When dry, the lesions become brown and dry, cracking, no white mold, and the expansion speed is slowed down. Infected with the neck or petiole, producing brown streaks. 2: Control method: select resistant varieties. Strictly eliminate diseased potatoes. Choose land plots with loose soil and good drainage, strengthen cultivation management, prevent and control water accumulation in the field, and avoid excessive application of nitrogen fertilizer. In the early stage of the disease, DuPont Kelu, metalaxyl manganese zinc, etc., drug control, spray once every 7-10 days, continuous spraying 2-3 times.
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