太子参病虫害防治（Heterophylla pest control）.doc

太子参病虫害防治（Heterophylla pest control） The prevention and control of pests and diseases of p.heterophylla should adhere to the prevention, comprehensive prevention and control principle, chemical control, biological pesticides should be preferred, followed by selection of chemical pesticides. Pesticide chemical control should limit the use of efficient, low toxicity and low residue, should strictly control the concentration and the amount of acres, the times, in a month before harvest p.heterophylla prohibited the use of any pesticide. 1, virus disease is from the most important diseases. The leaves of the damaged plants are wrinkled and the leaves are young and the tubers are thin and small. The disease generally occurs in the region, the incidence rate of up to 70%, serious harm and influence the yield and quality of Radix pseudostellariae. Control methods: (1) selecting resistant varieties. The best for seed planting, the mosaic rarely occur, and high yield; seeds with 0 low temperature treatment 50 days after sowing, can be cultivated without poisonous seedling; in order to establish no virus recovery for farming, for the production of large area; numerous bred their seed, seedtuber in the growing season must be found at any time at any time to reduce infectious mosaic strains; timely pest control, to ensure that the seed is not poisonous. After the discovery of the virus disease, you can choose virus, gram, virus, A and other agents to prevent and control. 2 spot disease, leaf spot disease occurred in spring and summer rainy season, plant foliage often rounded or irregularly shaped brown spots, the incidence of severe cases can lead to brown leaf dieback caused by root decreases, yield decreased. Control methods: remove diseased leaves, reduce the incidence of early winter bacteria source; Baoli ANN (polyoxin) 1000 times liquid spray control, mancozeb in late 70% of the 800 times liquid for prevention and treatment of each medication, adding appropriate foliar fer