Sublethal and Transgenerational Effects of Cyclaniliprole on Demographic Parameters in Rhopalosiphum padi and Schizaphis graminum (Hemiptera: Aphididae)

Cyclaniliprole is a novel third-generation anthranilic diamide insecticide which has broad-spectrum efficacy against various pests, including aphids. Rhopalosiphum padi and Schizaphis graminum are the two primary aphid species that infest wheat crops. This investigation evaluates cyclaniliprole’s acute toxicity and sublethal and transgenerational effects on both aphid species. The acute toxicity assessment revealed obvious insecticidal activity, with 24 h LC50 values of 38.56 mg/L for R. padi and 33.71 mg/L for S. graminum. Sublethal exposure (LC15 and LC35 in R. padi; LC35 in S. graminum) significantly reduced adult longevity and fecundity in the F0 generation. In the F1 generation, cyclaniliprole at LC35 significantly reduced the fourth nymph stage in R. padi, whereas at LC15, it shortened the third nymph stage duration in S. graminum compared to the control. Sublethal concentrations (LC15 and LC35) of cyclaniliprole significantly reduced age-stage-specific survival rate (sxj), age-specific survival rate (lx), age-specific maternity (lxmx), and age-stage life expectancy (exj) in the F1 generation of R. padi, while only LC35 decreased lx, lxmx, and exj in S. graminum. Additionally, LC35 significantly reduced the net reproductive rate (R0) in the F1 generation of R. padi compared to the control. These findings suggest that cyclaniliprole exhibit notable acute toxicity against both aphid species and that sublethal concentrations adversely affected the F0 generation, with no observed hormetic effects in the F1 generations of R. padi and S. graminum. The findings offer valuable insights for assessing the comprehensive insecticidal potential of cyclaniliprole.