It is understood that the main damage to the corn of Laodelphax striatellus is to spread the disease. Since maize has adult-stage resistance to rough dwarf disease, resistance is usually enhanced after the 9-leaf stage, and it is light even if it is affected. Therefore, the prevention and control of maize rough dwarf disease should be focused on adjusting the sowing period and avoiding disease, and the integrated measures of avoiding, resisting and treating with the disease-resistant varieties and scientific prevention and control of the planthopper should be adopted according to local conditions.
It is one of the effective measures to control the occurrence of corn rough dwarf disease. Before and after the wheat harvest, the adults of Laodelphax sphaerocephalus are in the prosperous period, and a large number of adults move into the corn fields. At this time, it is a crucial period for controlling the planthoppers in the corn field. The main effective agents for fast-acting larvae should be selected and used in combination with certain insecticides. The potency of the effective period. Drugs can use pymetrozine, rice Feng scattered, chlorpyrifos, isoprocarb, Zhongding Wei, beta cypermethrin and so on. It is worth noting that when organic phosphorus and pyrethroid pesticides used in corn fields are used to control SBPH, the concentration of the drug solution should be strictly controlled, otherwise it is easy to produce phytotoxicity. Generally, 50% of the rice oil used in the research is used in 1000-2000 times; 48% of the chlorpyrifos is used in 2000 times, and the dilution factor is not less than 1000 times; the pyrethroid pesticide is generally used in 2000-3000 times. The use of dichlorvos, pungent sulfuric acid and fenvalerate on corn is prone to phytotoxicity and is generally not to be used.
Previously, buprofezin was also used to control Laodelphax striatellus. However, according to the plant protection institute of Jiangsu Academy of Agricultural Sciences, the planthoppers in Jiangsu and other places have already produced strong resistance to buprofezin. This drug should not be used again. Prevention of planthoppers. In production, care should be taken to avoid drug abuse. It is best to use it alternately with other different types of drugs to delay drug resistance.
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