Rice Resistance Buffers against the Induced Enhancement of Brown Planthopper Fitness by Some Insecticides

The brown planthopper, Nilaparvata lugens (Stål)[BPH], is a damaging pest of rice in Asia. Insecticides and varietal resistance are widely implemented BPH management practices. However, outbreaks have been linked to excessive insecticide use—challenging the compatibility these two IR62 variety with against BPH, whitebacked Sogatella furcifera Horváth [WBPH], green leafhopper, Nephotettix virescens (Distant)[GLH]. We compared responses susceptible IR64 treated buprofezin, carbofuran, cartap hydrochloride, cypermethrin, deltamethrin, fipronil, or thiamethoxam + chlorantraniliprole. In greenhouse bioassays, fipronil chlorantraniliprole reduced egg laying on both varieties, and, together nymph survival zero. Buprofezin, hydrochloride stimulated laying, carbofuran increased biomass, but effects were IR62. Planthopper populations ten times higher deltamethrin-treated than untreated screenhouse experiment. Host failed buffer this insecticide-induced resurgence WBPH. effect GLH. Rice cypermethrin had yields controls, suggesting possible phytotoxic effects. found little evidence synergies between practices; host did undesirable some insecticides.