Abstract: In order to evaluate the effect of chlorantraniliprole, an insecticide in control of Lepidoptera larvae on rice plant, on the white-backed planthopper, Sogatella furcifera (Horváth), the rice-stem dipping method was used to test the toxicity of chlorantraniliprole to the experimental populations of S. furcifera, and the sublethal effects of chlorantraniliprole on S. furcifera were studied with life table. The results showed that the LC₅₀ doses of chlorantraniliprole to the 3th instar nymphs and adults of S. furcifera were 19.26 mg/L and 19.69 mg/L, respectively. After the 3th instar nymphs of S. furcifera were treated with the LC₁₀ and LC₂₅ of chlorantraniliprole, respectively, both the life span and the fecundity per female decreased in F₀ and F₁, and significant difference existed between the treatment of LC₂₅ and the control in F₀ and F₁ (P<0.05). Compared to the control, the treatment of LC₂₅ caused a decrease of 52.94 and 78.45 eggs laid per female in F₀ and F₁, respectively, and 1.80 d and 2.62 d less in the life span of female in F₀ and F₁, respectively. The developmental duration of different stages were affected after S. furcifera nymphs were treated with the LC₂₅ and LC10 of chlorantraniliprole. According to the survival rate and fecundity of S. furcifera treated by different doses of chlorantraniliprole, the life table of fecundity was constructed. We found that for LC₁₀ and LC₂₅ treatments the intrinsic rate of increase (rm) decreased by 11.25% and 34.41%, respectively, and the net reproductive rate (R₀) decreased by 36.56% and 74.57%, respectively, while the mean generation time (T) and population doubling time (t) were delayed. The results suggest that LC₂₅ and LC₁₀ of chlorantraniliprole can decrease the population growth of S. furcifera, and this insecticide will restrain the natural population growth of S. furcifera when it is used in the field in controlling the Lepidoptera larvae on rice plants.

Key words: Sogatella furcifera, chlorantraniliprole, toxicity, sublethal effects, life table