1. Potato late blight: Symptoms mainly affect leaves, stems and tubers. The leaves are infected. Firstly, green-brown spots are immersed in water at the tips of the leaves or leaves. Light green halos surround the lesions. When the humidity is high, the lesions expand rapidly, appear brown, and produce a circle of white mold, especially the back of the leaves. Obviously, the lesion became brown and dry when dry, crisp and easily cracked, no white mold was seen, and the expansion speed was slowed down. Stem or petiole affected, brown spots. Severely affected leaves wilted. Crinkling, and finally black rot of the whole plant, the whole field is a coke, emitting a smell of corruption. The tubers became infected, and the primary brown or purple-brown large patches were slightly sunken. The diseased subcutaneous potato was brown and gradually expanded or rotted around.
2, potato late blight field field pharmaceutical prevention. In time monitoring, the central diseased plant was found to be removed in a timely manner, brought out of the field and buried deep (more than 1 meter in depth), lime was disinfected at the disease point, and mancozeb, metalaxyl, and formazan were sprayed within 50 meters around the diseased plant. Manganese, zinc and other agents for preventive treatment
3, cutting knife disinfection: When sowing, prepare more than two cutting knives, immersed in a dish containing 0.1% potassium permanganate solution or 75% alcohol and other disinfectant, cut into pieces with one of the knife, when the cut After the diseased potato (or suspected diseased potato) and the rotten potato, change another knife.
4. Potato late blight prevention and control methods: prevention and control of potato late blight focus on prevention and control. First, strengthen cultivation and management, rational allocation of nitrogen and phosphate fertilizers, and increase potassium fertilizer; Second, strengthen monitoring, found that the central diseased plant immediately controlled the blockade, and The surrounding plots are sprayed with pesticides, and 62.5% of silver fertilizer is applied per 667 square meters and 100 g of water is uniformly sprayed in 30 kg for 2 to 3 consecutive times. Biacore or Tianfengsu can be added to promote growth. Strengthen disease resistance.
2, potato late blight field field pharmaceutical prevention. In time monitoring, the central diseased plant was found to be removed in a timely manner, brought out of the field and buried deep (more than 1 meter in depth), lime was disinfected at the disease point, and mancozeb, metalaxyl, and formazan were sprayed within 50 meters around the diseased plant. Manganese, zinc and other agents for preventive treatment
3, cutting knife disinfection: When sowing, prepare more than two cutting knives, immersed in a dish containing 0.1% potassium permanganate solution or 75% alcohol and other disinfectant, cut into pieces with one of the knife, when the cut After the diseased potato (or suspected diseased potato) and the rotten potato, change another knife.
4. Potato late blight prevention and control methods: prevention and control of potato late blight focus on prevention and control. First, strengthen cultivation and management, rational allocation of nitrogen and phosphate fertilizers, and increase potassium fertilizer; Second, strengthen monitoring, found that the central diseased plant immediately controlled the blockade, and The surrounding plots are sprayed with pesticides, and 62.5% of silver fertilizer is applied per 667 square meters and 100 g of water is uniformly sprayed in 30 kg for 2 to 3 consecutive times. Biacore or Tianfengsu can be added to promote growth. Strengthen disease resistance.
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