Department of Entomology and Wildlife Ecology, University of Delaware, Newark, DE.
Department of Entomology, Iowa State University, Science II, Ames, IA.
J Econ Entomol. 2020 Jun 6;113(3):1563-1567. doi: 10.1093/jee/toaa047.
European corn borer, Ostrinia nubilalis Hübner (Lepidoptera: Crambidae), has been present in the United States for over 100 yr and documented on >200 plant species, including economically valuable crops. The reported preferred host of O. nubilalis is corn, Zea mays L. (Cyperales: Poaceae), although it is considered to be a generalist agricultural pest. Life cycles of the two pheromone races, E and Z, align with the seasonality of different agricultural plants. Since the introduction of Bt corn in 1996, overall O. nubilalis presence has declined and suggests that alternative crop plants might not be suitable hosts. We investigated plant vegetation preference of third-instar Z-race O. nubilalis for leaf disks of corn and a variety of other crops using 48 h no-choice and choice tests. Z-race larvae gained more mass on V6 non-Bt field corn leaf disks in comparison to other plant species options. Additionally, a preference for non-Bt field corn leaf disks was observed in most comparisons. Higher consumption of cucumber, Cucumis sativus L. (Cucurbitales: Cucurbitaceae), leaf disks as compared to non-Bt field corn leaf disks suggested an ability to feed on excised leaf tissues of a plant species that does not induce defenses to herbivory.
欧洲玉米螟，Ostrinia nubilalis Hübner（鳞翅目：夜蛾科），已在美国存在超过 100 年，并在 200 多种植物上被记录，包括经济价值高的作物。据报道，欧洲玉米螟的首选寄主是玉米，Zea mays L.（禾本科：禾本科），尽管它被认为是一种农业害虫。两种信息素的生命周期，E 和 Z，与不同农业植物的季节性相吻合。自 1996 年 Bt 玉米引入以来，欧洲玉米螟的总体存在有所下降，这表明替代作物可能不是合适的寄主。我们使用 48 小时无选择和选择试验，调查了 Z 系第三代幼虫对玉米和多种其他作物叶片的植物植被偏好。与其他植物物种相比，Z 系幼虫在 V6 非 Bt 田间玉米叶片上获得的质量更多。此外，在大多数比较中，都观察到对非 Bt 田间玉米叶片的偏好。与非 Bt 田间玉米叶片相比，黄瓜 Cucumis sativus L.（葫芦科：葫芦科）叶片的消耗量更高，这表明幼虫能够以不诱导抗虫性的植物物种的离体叶片组织为食。
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