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<p><i>Spodoptera frugiperda</i> (J. E. Smith) is a globally invasive pest that poses significant threats to a variety of crops. It has a wide host range of more than 353 recorded plants from 76 families. However, the herbivorous insects could have adaptation mechanisms through physiological modifications in response to constitutive defenses of different host plants. The results revealed that feeding different host plants could significantly affect LC<sub>50</sub>s of broflanilide, chlorantraniliprole, tetraniliprole, indoxacarb, metaflumizone, lufenuron, methoxyfenozide, and spinetoram to <i>S. frugiperda</i> compared to rearing on <i>Zea mays</i> (L.). Detoxification enzyme activity assays and synergist tests indicated that changes in detoxification enzyme activity cause alterations in the susceptibility of <i>S. frugiperda</i> to insecticides. Knockdown of <i>UGT40F3</i> using RNA interference (RNAi) significantly increased susceptibility to tetraniliprole in all host-fed strains. Microscale thermophoresis (MST) and molecular docking revealed a robust tetraniliprole-UGT40F3 interaction, suggesting that UGT40F3 plays a pivotal role in tetraniliprole metabolism. These results showed that different host plants can influence the detoxification enzyme activity of <i>S. frugiperda</i>, leading to variations in its susceptibility to insecticides. These findings provide a&#xa0;scientific foundation&#xa0;for developing effective pest management strategies.</p>

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Effects of host plants on the insecticide susceptibility of Spodoptera frugiperda

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Yue Yuan,
  • Yaqin Zou,
  • Kaiyi Zeng,
  • Wenyan Duan,
  • Feiyue Ren,
  • Liutong Ye,
  • Jingjing Fang,
  • Zhihong Xu,
  • Xiaolei Zhang,
  • Junkai Li

摘要

Spodoptera frugiperda (J. E. Smith) is a globally invasive pest that poses significant threats to a variety of crops. It has a wide host range of more than 353 recorded plants from 76 families. However, the herbivorous insects could have adaptation mechanisms through physiological modifications in response to constitutive defenses of different host plants. The results revealed that feeding different host plants could significantly affect LC50s of broflanilide, chlorantraniliprole, tetraniliprole, indoxacarb, metaflumizone, lufenuron, methoxyfenozide, and spinetoram to S. frugiperda compared to rearing on Zea mays (L.). Detoxification enzyme activity assays and synergist tests indicated that changes in detoxification enzyme activity cause alterations in the susceptibility of S. frugiperda to insecticides. Knockdown of UGT40F3 using RNA interference (RNAi) significantly increased susceptibility to tetraniliprole in all host-fed strains. Microscale thermophoresis (MST) and molecular docking revealed a robust tetraniliprole-UGT40F3 interaction, suggesting that UGT40F3 plays a pivotal role in tetraniliprole metabolism. These results showed that different host plants can influence the detoxification enzyme activity of S. frugiperda, leading to variations in its susceptibility to insecticides. These findings provide a scientific foundation for developing effective pest management strategies.