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Migrating insects brown planthopper(BPH),Nilaparvata lugens St(?)l andwhite-backed planthopper(WBPH),Sogatella furcifera Horvath are both mostharmful insects on rice in China.Chemical control is thought to be the best wayto manage them,but it may cause insecticide resistance.Methamidophos,buprofezin,and imidacloprid were the three insecticides often used.In 2000and 2001,resistance of the field populations collected from three areas,i.e.Dongtai,Jiangsu Province,Anqing,Anhui Province,and Guilin,GuangxiAutonomous Region,to the three insecticides was monitored.The toxicities ofthe three insecticides were determined with the female adult(3-5 d after e-mergence)and by the topical application method with the hand microapplicator.
Migrating insects brown planthopper (BPH), Nilaparvata lugens St (?) L and white-backed planthopper (WBPH), Sogatella furcifera Horvath are both mostharmful insects on rice. China Chemical control is thought to be the best wayto manage them, but it may cause insecticide resistance. Methamidophos, buprofezin, and imidacloprid were the three insecticides often used. In 2000 and 2001, resistance of the field populations collected from three areas, ie. Dongtai, Jiangsu Province, Anqing, Anhui Province, and Guilin, Guangxi Autonomous Region, to the three insecticides was monitored. The toxicities of the three insecticides were determined with the female adult (3-5 d after e-mergence) and by the topical application method with the hand microapplicator.