Abstract: The inheritance of pest-insect's resistance to insecticide is not only an important factor affecting the development of resistance but also the basis for formulating resistance management strategy. The inheritance of resistance to buprofezin in the brown planthopper, Nilaparvata lugens (Stal),was studied through assaying dose-response data of the third nymhs of resistant® and susceptible(S) parents, reciprocal crosses (F₁ and F'₁), self-bred (F₂ and F'₂) and backcross (BC) progenies to buprofezin with the rice-stem dipping method. The results showed that the main resistant gene was autosomal and incompletely recessive, with degree of dominance (D) -0.3153 (F₁) and -0.3763 (F'₁); the chi-square analysis results of the dose-response data of F₂, F'₂　and BC pr ogeny was 42.11, 51.44 and 93.57 respectively, all higher than χ² 0.05=15.51(df=8), indicated that buprofezin resistance in the brown planthopper appears to be controlled by two or more genes. The resistance management tactics of N. lugens to buprofezin is also discuss ed here.

Key words: Nilaparvata lugens, rice-stem dipping method, buprofezin, inheritance of resistance