Dose-Dependent Effects of Avermectin on the Reproductive Biology of Scleroderma Sichuanensis
DOI:
https://doi.org/10.70749/ijbr.v4i3.2989Keywords:
Female wasps, avermectin, concentrations, width, length, measuringAbstract
Scleroderma sichuanensis is an important parasitoid used in the biological control of wood-boring pests. However, the extensive use of avermectin may negatively affect such beneficial insects. This study evaluated the impact of different concentrations of avermectin on the genital morphology of S. sichuanensis under controlled laboratory conditions. Seven concentrations (5, 20, 40, 60, 80, 100, and 120 mg/mL) were applied to adult females, while untreated individuals served as controls. Ovipositor length and width were measured in 30 wasps per treatment. The results demonstrated a clear concentration-dependent reduction in both parameters. At 5 mg/mL, ovipositor length and width decreased by 27.6% and 45.5%, respectively. At the highest concentration (120 mg/mL), reductions in length and width reached 96.8% and 95.6%, respectively. These findings indicate that sub-lethal exposure to avermectin induces significant morphological alterations in the reproductive structures of S. sichuanensis, potentially impairing its reproductive capacity and effectiveness as a biological control agent. These results show a clear dose-dependent effect of avermectin on reproductive morphology. The structural damage may reduce parasitoid fitness and threaten long-term population stability in agroecosystems. Therefore, integrating chemical control with conservation of beneficial parasitoids is essential for sustainable pest management.
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