Sublethal and Transgenerational Toxicities of Chlorfenapyr on Biological Traits and Enzyme Activities of (Hemiptera: Pseudococcidae).

Papaya mealybug, Williams and Granara de Willink (Hemiptera: Pseudococcidae), is an economically important, invasive insect that is now distributed worldwide. Chlorfenapyr has been demonstrated to have a significant control effect on . In order to evaluate the sublethal and transgenerational effects of chlorfenapyr on , the life table data of three consecutive generations were collected and analyzed by the age stage, two-sex life table method, and the enzyme activities were assayed using a spectrophotometer. The results showed that exposure to the insecticide had significant effects on the biological traits of subsequent generations of , and a higher intrinsic rate of increase (), finite rate of increase (), net reproductive rate (), and a shorter mean generation time () were observed in the chlorfenapyr-treated F mealybugs. Enzyme activity assays showed that chlorfenapyr significantly inhibited the activities of catalase (CAT) and peroxidase (POD) while activating the activities of superoxide dismutase (SOD), which suggested that SOD, CAT, and POD may play an important role in the self-defense of . against chlorfenapyr. These results conclusively demonstrated that exposure of to sublethal concentrations of chlorfenapyr induced hormetic effects on the F generation while having negative effects on the F and F generations.