The western bean cutworm, Striacosta albicosta (Smith) (Lepidoptera: Noctuidae), is historically a pest of both corn (Zea mays L. (Poales: Poaceae)) and dry beans (Phaseolus sp. L. (Fabales: Fabaceae)) in the western Great Plains. However, it has recently undergone an eastward range expansion establishing itself across the Corn Belt in 25 states and 4 Canadian provinces. To mitigate the effects of infestation in Michigan, foliar insecticides are used in dry beans, whereas management of the pest in corn relies more heavily on the use of Bt-expressing hybrids. In this study stable carbon isotope analysis was used to determine what crop adult moths developed on as larvae with analysis showing that very few of the adult moths developed on dry beans. These results suggest that beans and corn are not suitable as co-refuges and that mainly adults which developed on corn are contributing to the next generation of western bean cutworm in Michigan.

中文翻译：

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玉米和干豆上发育的幼虫对密歇根州西豆角虫成虫种群的贡献

西部豆角夜蛾 Striacosta albicosta (Smith) (鳞翅目：夜蛾科)，历史上是玉米 (Zea mays L. (Poales: Poaceae)) 和干豆 (Phaseolus sp. L. (Fabales: Fabaceae)) 的害虫西部大平原。然而，它最近经历了向东扩张，在 25 个州和加拿大 4 个省的玉米带上建立了自己的地位。为了减轻密歇根州的虫害影响，在干豆中使用了叶面杀虫剂，而玉米害虫的管理则更依赖于使用表达 Bt 的杂交种。在这项研究中，稳定碳同位素分析用于确定成虫在什么作物上发育为幼虫，分析表明很少有成虫在干豆上发育。