[Sublethal effect of chlorantraniliprole on the experimental population of non-target insect Nilaparvata lugens (Stål)].

Chlorantraniliprole is a newly developed insecticide targeting at lepidopteron pests in rice fields, whereas Nilaparvata lugens (Stål) is one of the important non-target pests of the insecticide. In this paper, the rice stem dipping method was adopted to test the toxicity of chlorantraniliprole to the 3rd instar nymphs and adults of N. lugens. The LC50 of chlorantraniliprole to the 3rd instar nymphs and adults was 26.85 and 35.53 mg.L-1, respectively. When the 3rd instar nymph was exposed to the LC10 and LC25 of chlorantraniliprole, the life span of the survived female adults was not significantly affected. However, when treated with LC25 dosage, the fecundity of the survived female adults was significantly reduced by 45.6 eggs. After the 3rd instar nymph was treated with the sublethal doses LC10 and LC25 of chlorantraniliprole, the fecundity of the F1, females were decreased significantly by 43.5 and 72.9 eggs, and the life span of the F1 females was shortened by 1.35 and 2.87 d, respectively. The developmental periods of all the instars of F, generation were delayed after treated with the sublethal doses LC10 and LC25 of chlorantraniliprole. The intrinsic rate of increase (rm) was decreased by 12.8% and 23.5%, and the net reproductive rate (R0) was decreased by 37.4% and 68.7%, respectively. Meanwhile, the mean generation time (T) and population doubling time (t) were delayed. Overall, the sublethal doses of chlorantraniliprole could suppress the population growth of N. lugens.