Sublethal effects of anthranilic diamide insecticides on the demographic fitness and consumption rates of the Coccinella septempunctata (Coleoptera: Coccinellidae) fed on Aphis craccivora.

As for developing effective integrated pest management (IPM), it is necessary to understand the sublethal effects of common insecticides on the non-target beneficial arthropods. In this lab-scale study, the sublethal effects of two anthranilic diamide insecticides chlorantraniliprole and cyantraniliprole on the populations of 7-spot ladybird Coccinella septempunctata (Coleoptera: Coccinellidae) were determined and compared using an age-stage, TWO-SEX life table and CONSUME-MSChart computer program. Cyantraniliprole at low-lethal concentrations of 1 and 10 mg L-1 significantly prolonged the larval stages and reduced the total adult longevity, compared with the control. Additionally, the net reproductive rate (R0), intrinsic rate of increase (r), finite rate of increase (λ), and mean generation time (T) were significantly reduced in the group treated with 10 mg L-1 of cyantraniliprole. Similarly, the net predation (C0), the finite predation rate (ω), and stable predation rate (ψ) were significantly reduced by cyantraniliprole at 1 and 10 mg L-1. In contrast, no significant difference in the demographic parameters above was determined for chlorantraniliprole at 1 mg L-1. Therefore, C. septempunctata population may develop faster and possess greater predation potential against aphids under the exposure of chlorantraniliprole, compared to cyantraniliprole. Chlorantraniliprole may be a preference to cyantraniliprole as a combined alternative with ladybeetle predators in IPM framework.