BACKGROUNDThe rice striped stem borer (SSB), Chilo suppressalis, a major pest in rice cultivation, presents a management challenge because of increasingly prevalent resistance to insecticides. Controlling pests during the egg stage is critical for preventing crop damage; however, most insecticides target the larvae. In the present study, we evaluated the ovicidal and neonate‐killing effects of 21 insecticides on SSB eggs and neonatal larvae.RESULTSThe ovicidal activities of diflubenzuron and phoxim, which effectively reduced egg hatching rates, were the highest: 98.26% and 93.40% at 500 mg/L and 71.86% and 69.42% at 100 mg/L, respectively. Spinosyns and ivermectins exhibited high neonate‐killing toxicity, at 500 and 100 mg/L applications at the egg stage, respectively, with almost 100% neonate larvae mortality, thereby effectively targeting neonates before they entered the rice stems. However, two insect growth regulators, pyriproxyfen and lufenuron, which are effective against the eggs of other species, were less effective against SSB eggs. In addition, we observed that insecticide sensitivity decreased with SSB egg development, highlighting the importance of targeting younger eggs. Population‐specific variation was also observed in the susceptibility of the eggs to spinetoram, with the highest ovicidal rates observed for the Yongxiu and Chongren populations.CONCLUSIONThis study highlights the importance of early‐stage pest control in SSB and the need for developmental‐stage‐focused and population‐specific management strategies. These findings support the incorporation of ovicidal and larvicidal insecticides into integrated pest management approaches to increase pest control efficacy. © 2025 Society of Chemical Industry.

中文翻译：

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常用杀虫剂对稻条纹螟 （Chilo suppressalis） 的杀卵和杀灭新生儿活性

背景水稻条纹螟 （SSB） Chilo suppressalis 是水稻种植中的一种主要害虫，由于对杀虫剂的耐药性日益普遍，因此带来了管理挑战。在卵期控制害虫对于防止作物受损至关重要;然而，大多数杀虫剂都针对幼虫。在本研究中，我们评估了 21 种杀虫剂对 SSB 卵和新生儿幼虫的杀卵和杀灭新生儿效果。结果二氟苯脲和磷辛的杀卵活性最高，分别为 500 mg/L 时为 98.26% 和 93.40%，100 mg/L 时分别为 71.86% 和 69.42%。Spinosyns 和伊维菌素表现出高新生儿杀伤毒性，在卵期分别施用 500 和 100 mg/L，新生儿幼虫死亡率几乎为 100%，从而在新生儿进入稻秆之前有效靶向新生儿。然而，两种昆虫生长调节剂吡丙醚和虱螨脲对其他物种的卵有效，但对 SSB 卵的效果较差。此外，我们观察到杀虫剂敏感性随着 SSB 卵的发育而降低，突出了针对年轻卵的重要性。在卵对 spinetoram 的敏感性中也观察到种群特异性变化，在永秀和崇仁种群中观察到最高的杀卵率。结论该研究强调了早期害虫防治在 SSB 中的重要性以及需要以发育阶段为重点和针对特定人群的管理策略。这些发现支持将杀卵和杀幼虫剂纳入害虫综合管理方法，以提高害虫防治效果。© 2025 化工学会.