Spinetoram, a spinosyn insecticide is used to manage lepidopteran pests, including diamondback moth, Plutella xylostella. In addition to determining the lethal effects, identifying low and/or sublethal effects of an insecticide is crucial to understanding the total impact of an insecticide. We assessed the low lethal and sublethal effects of spinetoram on two successive generations of P. xylostella. The initial bioassay results showed that spinetoram exhibited high toxicity against P. xylostella with an LC₅₀ of 0.114 mg L⁻¹ after 48 h exposure. The low lethal (LC₂₅) and sublethal (LC₁₀) concentrations of spinetoram showed significant reduction in pupation rate, pupal weight and adult emergence. The fecundity of F₁ generation was significantly lower in LC₂₅ (117.85 eggs/female) and LC₁₀ (121.34 eggs/female) treated group than untreated control (145.32 eggs/female). The intrinsic rates of increase (r) was significantly lower (r = 0.1984 day⁻¹) in spinetoram treated P. xylostella F₁ progeny compared to untreated control (r = 0.2394 day⁻¹). Our results suggest that LC₁₀ and LC₂₅ concentration of spinetoram might affect P. xylostella population growth by reducing its survival, development, and reproduction.

Spinetoram是一种多杀菌素杀虫剂，用于防治鳞翅目害虫，包括小菜蛾，小菜蛾（Plutella xylostella）。除了确定致死作用外，确定杀虫剂的低和/或亚致死作用对于了解杀虫剂的总体影响至关重要。我们评估了Spinetoram对连续两代P. xylostella的低致死和亚致死作用。最初的生物测定结果显示，多杀菌素在暴露48小时后对小菜蛾表现出高毒性，LC ₅₀为0.114 mg L ^-1。低致死性（LC ₂₅）和亚致死性（LC ₁₀）的多杀菌素浓度显着降低化脓率，化weight重量和成年出苗率。LC ₂₅（117.85个鸡蛋/雌性）和LC ₁₀（121.34个鸡蛋/雌性）处理组中F ₁代的繁殖力显着低于未处理的对照组（145.32个鸡蛋/雌性）。增加（的固有速率- [R ）为低显著（[R  =0.1984天^-1在多虫菌素处理的）小菜蛾˚F _1个与未处理的对照（子代- [R  =0.2394天^-1）。我们的结果表明LC ₁₀和LC ₂₅多杀菌素的浓度可能会降低小菜蛾的生存，发育和繁殖，从而影响小菜蛾种群的生长。