Monitoring of resistance to several insecticides in brown planthopper （Nilaparvata lugens） in Huizhou
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Key Words：Nilaparvata lugens, insecticide, resistance, monitoring
Abstract： The susceptibility of the brown planthopper (BPH ), Nilaparvata lugens (Stal) to imidaeloprid，buprofezin, isoprocarb, butylene-fipronil , nitenpyram and chlorpyrifos,was monitored using the rice-stem dipping method in Huizhou, 2009. The results indicate that local BPH populations have strong resistance to imidacloprid (resistance ratio of 422.2-fold), medium resistance to buprofezin and isoprocarb (resistance ratios of 11.0-14.0-fold, respectively), low resistance to butylene -fipronil (3.7-fold) and were still susceptible to nitenpyram and chlorpyrifos (resistance ratio <3-fold). The rational use of insecticides for N. lugens management is discussed in light of these results.