Control technology of main diseases and insect pests of potato Now most of the potatoes in Shandong Province have entered the group planting stage. After this period, the main occurrence time of potato diseases and insect pests is. A classification of potato diseases and insect pests From the type of disease: pathogen infection disease, physiological disease Classification from pathogenic bacteria: fungal disease, bacterial disease, mycoplasma, virus disease From the parts of the disease: above ground diseases, underground diseases (soil borne diseases) Pests include ground pests and underground pests Symptoms and control of major fungal diseases 1Late blight At the beginning of infection, there will be small dark round spots like water immersion on the leaves, and the water immersion ring will appear at the junction of disease and health. Symptoms of late blight on the stem: the stem is black and the buds are dry.When the humidity is high, there will be a gray white mold layer on the back of the leaf and the junction of disease and health on the stem. When the weather is dry, the mold layer is not obvious. Potato late blight The disease spreads rapidly and is commonly known as "horse racing".In the case of improper control, it will infect the whole field and seriously affect the yield and quality. It is a disease that the potato planting area attaches great importance to. Potato late blight is a typical air borne disease.Once spores are formed, they can be found 500 meters around the center of the pathogen in windy conditions.There are more than 20 physiological races with high temperature and low temperature, but the air humidity should be more than 90%. Prevention and control: select disease-free seed tuber; eradicate the disease center and take it out of the field; protect the disease free area; reduce the field humidity; mix properly according to the characteristics of the chemicals, mix the protective chemicals and therapeutic chemicals, and arrange the interval reasonably. Protective agents: propionate zinc, diesenlian, diesenmanganese zinc, thiazole zinc, cuprous oxide, cupric hydroxide. Therapeutic agents: yinfali, Kelu, frost cyanogen, enylmorpholine, yikuaijing, haloperidol, Baitai, XiPai. 2Early blight The early blight spots have concentric whorls. The pathogen belongs to Alternaria spp., which invades the mesophyll and produces toxin, making the leaves yellow, curled up, brittle and premature aging.The disease is a high temperature and high humidity disease, prone to temperature of 26-28 ℃, which belongs to the air borne disease, agricultural operation will also spread. Control: carbendazim, tebuconazole, pyrazolyl ester, mixed amino acid, humic acid foliar fertilizer.It is forbidden to spray strong oxidant pesticides. 3Black mole disease In recent two years, the incidence of nevus disease is widespread in China, and it is increasing year by year.Brown fusiform disease spots are formed on stolon and main stem. The new leaves can be seen curly and a little yellow on the ground part, and then the root will be damaged when the root is pulled out. In the process of germination, nevus disease and bud necrosis occurred. The diseased tubers planted in the field will make the main buds necrotic, and then sprout again. The sprouts are not strong and yellow. It forms ulcer spots on the main stem. In the case of further aggravation of the disease, aerial tubers are produced on the ground. The pathogen of nevus disease can be transmitted by tuber, and the plot of ziah continuous cropping all year round can also be transmitted by soil. With Rhizoctonia solani, the disease was serious in low temperature and humidity.Low ground temperature at sowing time is beneficial to the occurrence of the disease, and late emergence can also increase the incidence of the disease. Prevention and treatment: nevi disease has been studied, but there is no good way Using disease-free seed potato; seed dressing with chemicals; spraying ditch with chemicals; sowing in proper time to avoid sowing under low ground temperature; after seedling preparation, combined with drip irrigation, the effect of this measure is better. Symptoms and control of three major bacterial diseases 1Scab Scab is caused by actinomycetes. It is a soil borne and seed borne disease. Prevention and control: disease-free potato; seed dressing with chemicals; soil disinfection; balanced water supply; mulching with plastic film. Selected medicaments: chunleimycin and a

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