Wu Meng-Ling, Zhao Hao-Yang, Liu Tong-Xian, Pan Ming-Zhen
Key Lab of Integrated Crop Pest Management of Shandong Province, College of Plant Health and Medicine, Qingdao Agricultural University, Qingdao, 266109, China.
Environ Entomol. 2023 Feb 17;52(1):74-80. doi: 10.1093/ee/nvac098.
When the favored host of an herbivorous insect pest is absent, the availability of alternative host plants can maintain insect pest populations. Spodoptera frugiperda (Lepidoptera: Noctuidae) is a major invasive, polyphagous insect pest in China. To investigate the suitability of Chinese cabbage as an alternative host for S. frugiperda, oviposition preferences and life history traits were determined for S. frugiperda on Chinese cabbage, corn, and winter wheat over three generations. Results showed that S. frugiperda females preferred to lay their eggs on corn compared to winter wheat and Chinese cabbage. The survival rate of S. frugiperda decreased after switching from corn to Chinese cabbage, only 6% of individuals successfully pupated in the third generation. In addition, S. frugiperda reared on Chinese cabbage had lower pupal weight and fecundity. Winter wheat was a good host for S. frugiperda; although the survival rate decreased when S. frugiperda switched from corn to winter wheat in the parental generation, the survival rate increased over the next two generations to be as high as those reared on corn. Chinese cabbage is not a good long-term host for S. frugiperda, but it could maintain the pest population for at least two generations when more suitable host plants are unavailable. These results will inform management strategies for S. frugiperda.
当食草害虫偏爱的寄主植物不存在时，其他替代寄主植物的可获得性能够维持害虫种群数量。草地贪夜蛾（鳞翅目：夜蛾科）是中国一种主要的入侵多食性害虫。为了研究大白菜作为草地贪夜蛾替代寄主的适宜性，在三代时间里测定了草地贪夜蛾在大白菜、玉米和冬小麦上的产卵偏好及生活史特征。结果表明，与冬小麦和大白菜相比，草地贪夜蛾雌虫更喜欢在玉米上产卵。从玉米转换到大白菜后，草地贪夜蛾的存活率下降，在第三代只有6%的个体成功化蛹。此外，在大白菜上饲养的草地贪夜蛾蛹重和繁殖力较低。冬小麦是草地贪夜蛾的良好寄主；虽然在亲代中草地贪夜蛾从玉米转换到冬小麦时存活率下降，但在接下来的两代中存活率增加，与在玉米上饲养的一样高。大白菜不是草地贪夜蛾的良好长期寄主，但在没有更适宜寄主植物时，它能够维持害虫种群至少两代。这些结果将为草地贪夜蛾的管理策略提供依据。
