Tepa-Yotto Ghislain T, Douro-Kpindou Ouorou Kobi, Koussihouédé Précieux Sèna Bonaventure, Adjaoké Abissi Marc, Winsou Jeannette K, Tognigban Ghislain, Tamò Manuele
Biorisk Management Facility (BIMAF), International Institute of Tropical Agriculture (IITA-Benin), Cotonou 08-01000, Benin.
Ecole de Gestion et de Production Végétale et Semencière (EGPVS), Université Nationale d'Agriculture (UNA), Kétou 43, Benin.
Insects. 2024 Mar 26;15(4):225. doi: 10.3390/insects15040225.
The fall armyworm (FAW) (Lepidoptera, Noctuidae) has now become an invasive pest of global concern. The pest was first detected in Central and Western Africa in early 2016. Sustainable management options explored by stakeholders during early FAW invasion in Africa included the use of biopesticides and biological control. The current study aimed to compare the susceptibility of FAW larvae to SfMNPV with the assumption that the virus isolated from FAW populations in Africa has higher virulence compared with an isolate from Argentina (SfMNPV-ARG). We also hypothesized that host plant plays a role in SfMNPV efficacy and that cannibalism mediates horizontal and vertical transmission of the virus. This work provides pioneering data on the virulence of the new SfMNPV isolate from Nigeria (SfMNPV-KA1), which proved more effective than its exotic counterpart from Argentina (SfMNPV-ARG). The host plant effect made a significant difference between maize and onion with more FAW death in the larvae fed with contaminated onion 5 days post treatment. The study demonstrates and discusses the effect of cannibalism on virus transmission.
草地贪夜蛾（鳞翅目，夜蛾科）现已成为全球关注的入侵害虫。该害虫于2016年初在中非和西非首次被发现。在草地贪夜蛾早期入侵非洲期间，利益相关者探索的可持续管理方案包括使用生物农药和生物防治。本研究旨在比较草地贪夜蛾幼虫对SfMNPV的敏感性，假设从非洲草地贪夜蛾种群中分离出的病毒比从阿根廷分离出的病毒（SfMNPV-ARG）具有更高的毒力。我们还假设寄主植物在SfMNPV的效力中起作用，并且同类相食介导病毒的水平和垂直传播。这项工作提供了关于来自尼日利亚的新SfMNPV分离株（SfMNPV-KA1）毒力的开创性数据，该分离株被证明比其来自阿根廷的外来对应物（SfMNPV-ARG）更有效。寄主植物效应在玉米和洋葱之间产生了显著差异，处理后5天，取食受污染洋葱的幼虫中草地贪夜蛾死亡更多。该研究展示并讨论了同类相食对病毒传播的影响。
