Sublethal and transgenerational effects of six insecticides on Bactrocera dorsalis (Hendel) (Diptera: Tephritidae)

To clarify the effects of sublethal concentration of insecticide on the growth, development and reproduction of Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), the sublethal and transgenerational effects of the LC30 of six insecticides on adults and progeny (F-1 and F-2 generations) were studied using age-stage, two-sex life tables. Exposure to six insecticides had significant negative impacts on the life-history traits of B. dorsalis and led to reduced adult longevity and fecundity in F-0, a longer larval stage duration in F-1, and reduced fertility and survival. The intrinsic rate of increase (r), finite rate of increase (lambda), and net reproductive rate (R-0) were reduced in F-1, with the greatest reduction observed in the chlorpyrifos treatment. In the F-2 generation, the adverse effects were weakened, only the cyantraniliprole treatment had lower values than the control, and the fecundity of other treatments returned to normal. Obvious "hormesis" phenomena were not observed in any of the generations. Based on the population hazard index, chlorpyrifos had the best control effect in the early stage, and cyantraniliprole had the best control effect in the long term. These results indicate that the LC30 of the six insecticides exert different transgenerational effects on the B. dorsalis population.