State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
College of Plant Protection, Key Laboratory of Integrated Management of Crop Disease and Pests, Ministry of Education, Nanjing Agricultural University, Nanjing, China.
J Econ Entomol. 2022 Feb 9;115(1):124-132. doi: 10.1093/jee/toab235.
The fall armyworm, Spodoptera frugiperda (Smith), is an invasive pest of cereal crops that now inhabits southern China year-round. Cultivation of crops unsuitable as host plants has been an effective pest management strategy for some insect pests, but the effects of green manure crops on S. frugiperda have not been investigated. An age-stage two-sex life table and tethered flight performance of S. frugiperda reared on different green manure species were obtained, and a population dynamics model established. Developmental durations of stages, survival rates, and fecundities of S. frugiperda differed significantly depending on host plant. Larvae fed Astragalus sinicus L. did not complete development. Although some larvae fed Vicia villosa Roth and Vicia sativa L. completed development, generation time was significantly prolonged, egg production was halved, and net reproductive rate decreased to 31% and 3% of those reared on corn, respectively. Survival rates of early-instars fed V. villosa and V. sativa were significantly lower than those fed corn. Population dynamics projections over 90 d showed the number of generations of S. frugiperda fed on V. villosa and V. sativa was reduced compared to those reared on corn. Flight performance of S. frugiperda reared on V. villosa decreased significantly compared to corn. Our results show that the three green manure species are unsuitable host plants for S. frugiperda. Therefore, reduction of corn production in southern China through rotation with these green manure crops may be a feasible method of ecological management of this major corn pest in China.
秋黏虫，Spodoptera frugiperda (Smith)，是一种入侵性的谷类作物害虫，现已在中国南方全年栖息。种植不适合作为寄主植物的作物一直是一些害虫的有效害虫管理策略，但绿肥作物对 S. frugiperda 的影响尚未得到调查。我们获得了在不同绿肥物种上饲养的 S. frugiperda 的龄期-两性生命表和系留飞行性能，并建立了种群动态模型。S. frugiperda 的各阶段发育持续时间、存活率和繁殖力因宿主植物而异。以紫云英为食的幼虫未能完成发育。尽管一些以野豌豆和普通菜豆为食的幼虫完成了发育，但世代时间显著延长，产卵量减半，净生殖率分别降至以玉米为食的 31%和 3%。以野豌豆和普通菜豆为食的幼虫早期的存活率明显低于以玉米为食的幼虫。90 天以上的种群动态预测显示，以野豌豆和普通菜豆为食的 S. frugiperda 的世代数与以玉米为食的相比有所减少。以野豌豆为食的 S. frugiperda 的飞行性能与玉米相比显著下降。我们的研究结果表明，这三种绿肥作物都不是 S. frugiperda 的适宜寄主植物。因此，通过与这些绿肥作物轮作来减少中国南方的玉米产量，可能是中国这种主要玉米害虫生态管理的一种可行方法。
