Biological invasion is a global concern with species deployed out of native range, the most recent in Africa being the invasion by fall armyworm (FAW) Spodoptera frugiperda J.E. Smith (Lepidoptera: Noctuidae). One of the most mentioned ecological consequences is the capacity of invaders to change native communities' structure. Busseola fusca Fuller (Lepidoptera: Noctuidae) has long been the most destructive pests of maize in Africa. Few or no studies have attempted to look at the interaction between FAW and native maize pests over a cropping cycle for sustainable management. Maize trials were established over two cropping cycles in Cameroon to investigate the nature of such interactions and eventual sharing of parasitoids. FAW incidence decreased with maize growth, while the reverse was observed for stemborers. Few cases of co‐occurrence were recorded at the later maize growth stage. There was a clear indication that FAW infestation was associated with vegetative stages, while stemborers were associated with reproductive stages. Only FAW eggs were found on abaxial and adaxial leaf surfaces, while only stemborer eggs were inside leaf sheaths. Similarly, while larvae of both groups were found in maize whorl and on ears, only FAW larvae were found in closed tassels, while only stemborers were found inside stems. These results are in favour of segregation in time and space in plant colonization by native and invasive pests, which may limit competition and exacerbates damage if no control is provided. The same egg, larval and pupal parasitoids respectively Telenomus remus, Cotesia icipe and Procerochasmias nigromaculatus emerged from isolated FAW and B. fusca eggs, larvae, and pupae. The sharing of parasitoids by both species provides a unique opportunity for augmentative biocontrol.

中文翻译：

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喀麦隆秋粘虫和玉米螟虫对拟寄生物的时空划分和共享

生物入侵是一个全球关注的物种，部署在本地范围之外，非洲最近的一次入侵是秋季粘虫（FAW）草地贪夜蛾 JE Smith（鳞翅目：夜蛾科）。最常提及的生态后果之一是入侵者改变当地社区结构的能力。Busseola fusca Fuller（鳞翅目：夜蛾科）长期以来一直是非洲玉米最具破坏性的害虫。很少或没有研究试图研究秋粘虫与本地玉米害虫在一个种植周期内的相互作用以实现可持续管理。在喀麦隆建立了两个种植周期的玉米试验，以研究这种相互作用的性质和寄生蜂的最终共享。秋粘虫发病率随玉米生长而下降，而茎螟的发病率则相反。在后期的玉米生长阶段记录到的同时发生的情况很少。有明确的迹象表明秋粘虫侵染与营养阶段有关，而茎螟与繁殖阶段有关。仅在背面和正面叶表面上发现了秋粘虫卵，而在叶鞘内仅发现了螟虫卵。同样，虽然两组的幼虫都在玉米轮毂和穗上发现，但在闭合的雄穗中只发现了秋粘虫幼虫，而在茎内只发现了螟虫。这些结果有利于本地和入侵害虫在植物定殖中的时间和空间隔离，如果不提供控制，这可能会限制竞争并加剧损害。相同的卵、幼虫和蛹寄生虫分别是 Telenomus remus、Cotesia icipe 和 Procerochasmias nigromaculatus 从分离的 FAW 和 B. fusca 卵、幼虫和蛹。两个物种共享寄生蜂为增强生物防治提供了独特的机会。