Resistance risk assessment and associated fitness cost of fluxametamide in the rice stem borer, Chilo suppressalis Walker (Lepidoptera: Pyralidae)

文献类型： 外文期刊

第一作者： Amponsah, Priscilla

作者： Amponsah, Priscilla;Hasnain, Ali;Wang, Yuan;Zhan, Enling;Zhao, Chunqing;Luo, Guanghua;Zhu, Bin

作者机构：

关键词： Fluxametamide; Chilo suppressalis; Resistance risk; Realized heritability; Fitness cost

期刊名称：CROP PROTECTION （ 影响因子：2.5； 五年影响因子：3.0 ）

ISSN： 0261-2194

年卷期： 2025 年 197 卷

页码：

收录情况： SCI

摘要： The rice stem borer (RSB), Chilo suppressalis Walker, is a major agricultural pest resistant to multiple insecticides, emphasizing the need for novel insecticides. Fluxametamide, a recently developed isoxazoline insecticide, has demonstrated strong efficacy against lepidopteran pests, including RSB. In this study, the resistance risk of RSB to fluxametamide was evaluated, along with the potential fitness costs associated with resistance. After 10 generations of continuous selection, the LC50 values for third-instar larvae of RSB increased from 0.195 mg/kg to 0.392 mg/kg, resulting in a 2.01-fold rise in resistance. The realized heritability (h2) was 0.082, and the predicted rate of resistance development suggested that with a slope of 1.920 and h2 of 0.082, a 10-fold increase in LC50 would require 13 to 29 generations using selection intensities of 90 % and 50 %, respectively. The life table analysis showed a significant increase in durations of the egg stage, first-and sixth-instar larvae, for the fluxametamide-selected (Flux-SEL) strain, while the pupal durations, male and female longevity, pupal weights, and fecundity were significantly reduced compared to the laboratory strain (WT). A significant decrease in the intrinsic rate of increase (r), the finite rate of increase (lambda), and the net reproduction rate (R0) was also observed in the Flux-SEL strain. The final relative fitness (Rf) value of 0.52 was obtained after 10 generations of selection. These findings provide an understanding of laboratory-induced insecticide resistance evolution and the related fitness costs in RSB. This information is valuable for developing effective fluxametamide application strategies aimed at managing resistance in RSB.

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