The early prevention of tomato virus disease prevention

In order to prevent the spread of tomato virus disease, we investigated the disease, which was attributed to the early low temperature potential of the aphid and the spread of high temperatures in the middle and later stages. In 1999, it summarized and promoted combined measures for prevention and prevention in the early and middle stages. The prevention and control effect reached 93.58%, the commodity rate increased by 71.24%, and the value-added per mu was 792.3 yuan. 1. Treat seedbed seedling seedlings from mid-March to mid-April seedling nursery period, disinfect the surface of seedbed, use 0.25 kg of tomato seedling disease prevention agent, 2.5 kg of fine dry earth, spread 5 m2 of bed surface or use 25% Seed coating agent 100 times spray bed surface, deep cultivator fine seedlings and sowing of tomato seeds, the species can choose the thick skin resistant disease-free growth type Lishen 8, Jinkang 1, Jin tomato 1 and red anti-218. 2, sand window cold seedlings antivirus virus in mid-April to early May seedlings cool seedlings, seedling height of 10 to 15 centimeters when the temperature rises and stabilizes, uncover the cold film seedlings, then cover the sand window, ventilation light piers seedlings long, prevent Overwintering poisonous locusts infect the virus and require low temperature at night to cover the membrane. 3, timely planting pollination plant in early May to mid-May tomato colonization period, 90% to 95% of the main planting varieties, 10% to 5% of the supporting pollination plants, scattered varieties of main varieties, cross-flowering easy to set fruit, Increase anti-reverse output. Pollination strains, flowering period should be slightly earlier, such as Lisheng 8 with red anti-218 is more appropriate. 4. Inoculation of fruit before the treatment of mites The period from mid-May to early July is the early stage of the early growth of tomatoes, the lead has been inserted, the second generation of cotton bollworm is infested, and the winged mites have moved to transfer the virus. Can be used to 2.5% net or 33% water disinfection of the drug to deal with aphids, and the Helicoverpa armigera. 5. Strictly sterilize the tomato after the middle of June. The sprouting of the virus is rapid. The latent strain of the virus latently oozes and is easily exposed to infection and transmission of the virus. It is possible to formulate 50 times the virus, or 25 times the virus A, the scissors or finger picking disinfectant to wipe the buds. 6. Optimization of prescription insecticides In mid-June, pests such as aphids, cotton bollworm, whitefly, diamondback moth, and spotted fly were mixed. Can be used 5% cis-cyanochlorohydrin 1000 times, or 2.5% 800 times Xincimethyl Chloride, or 4.5% of high-efficiency chlorocyano 1000 times and 200 times Bt emulsion, or 1500 times diflubenzuron control, can achieve a spray more governance Effect.

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