Lambda-cyhalothrin is a synthetic pyrethroid insecticide that is widely used to control leaf-eating pests. Because of increased insecticide resistance, an understanding of sublethal cross-generational effects of insecticides is important. We examine the effects of sublethal concentrations (SLCs) (LC₁₀, LC₂₀, and LC₄₀) of lambda-cyhalothrin on the growth, reproduction, and detoxification enzyme activities of F₀ and F₁ generation Henosepilachna vigintioctomaculata. Lambda-cyhalothrin is toxic to adult H. vigintioctomaculata, with an LC₄₀ at 48 h of 0.355 mg L⁻¹. At SLCs, lambda-cyhalothrin significantly reduces the longevity and average fecundity of F₀ and F₁ adults, and prolongs the durations of the egg, larval, and pupal stages and adult preoviposition period. Additionally, an increased lambda-cyhalothrin concentration significantly decreases net reproductive rates, and both finite and intrinsic rates of increase in the F₁ generation, and significantly increases the average generation cycle. The detoxification enzyme activity of F₁ adults treated with SLCs of lambda-cyhalothrin for 48 h trends upwards. Results indicate that low concentrations of lambda-cyhalothrin induce glutathione S-transferase and carboxylesterase activities and inhibit multifunctional oxidase activity. The growth, development, and reproduction of the H. viltioctomaculata F₁ population remain inhibited by lambda-cyhalothrin treatment in the adult stage, and inhibitory effects increase with increased lambda-cyhalothrin concentration. The control efficacy of lambda-cyhalothrin against H. viltioctomaculata shows cross-generational effects.

Lambda-cyhalothrin is a synthetic pyrethroid insecticide that is widely used to control leaf-eating pests. Because of increased insecticide resistance, an under-standing of sublethal cross-generational effects of insecticides is important. We exam-ine the effects of sublethal concentrations (LC) (LC10, LC20, and LC40) of lamb-da-cyhalothrin on growth, reproduction, and detoxification enzyme activities of F0 and F1 generation Henosepilachna vigintioctomaculata. Lambda-cyhalothrin is toxic to adult H. vigintioctomaculata, with an LC40 at 48 h of 0.355 mg L−1. At sublethal concentrations, lambda-cyhalothrin significantly reduces the longevity and average fecundity of F0 and F1 adults, and durations of egg, larval, and pupal stages and adult preoviposition period. Additionally, increased lambda-cyhalothrin concentration significantly de-creases net reproductive rates, and both finite and intrinsic rates of increase of the F1 generation, and significantly increases average generation cycle. Detoxification en-zyme activity of F1 adults treated with sublethal concentrations of lambda-cyhalothrin for 48 h trends upwards. Results indicate that low concentrations of lamb-da-cyhalothrin induce glutathione S-transferase and carboxylesterase activities and inhibit multifunctional oxidase activity. We demonstrate the ability of lamb-da-cyhalothrin to control H. vigintioctomaculata, provide a theoretical basis for the ef-fective control of this pest, and identify an appropriate concentration to do so.