State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, Shaanxi 712100, China.
J Econ Entomol. 2023 Jun 13;116(3):790-797. doi: 10.1093/jee/toad065.
The fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith), is a significant invasive pest identified as a serious threat to global agricultural production and food security. However, its ovipositional preference, larval feeding selectivity, and nutritional indices are less studied. Here, we investigated these traits of FAW when fed on maize, wheat, soybean, tomato, cotton, and Chinese cabbage, and analyzed the correlation between its nutritional indices and the nutritional contents of crops. The results showed that the highest number of eggs were laid on maize and the lowest number were laid on tomato. The highest feeding choice rate of third instar larvae was on maize, and the lowest was on Chinese cabbage. The fifth instar larvae showed the highest feeding choice rate on maize, but no significant differences were found among other crop species. The food consumption (FC), the relative growth rate (RGR), and the approximate digestibility (AD) were significantly higher on maize and wheat, while the efficiency of conversion of ingested food (ECI) and the efficiency of conversion of digested food (ECD) were significantly higher when fed on cotton and Chinese cabbage. The FC, the relative consumption rate (RCR), RGR, and AD were significantly and positively correlated with soluble sugar and protein contents of host plants, while the ECI and ECD were significantly and negatively correlated with the soluble sugar content. The present study indicates that FAW may cause potential economic losses to these crops besides maize, and these findings are valuable in managing and controlling this pest.
秋黏虫（FAW），Spodoptera frugiperda（J.E. Smith），是一种重要的入侵性害虫，被认为是对全球农业生产和粮食安全的严重威胁。然而，其产卵偏好、幼虫取食选择性和营养指标的研究较少。在这里，我们研究了 FAW 在以玉米、小麦、大豆、番茄、棉花和白菜为食时的这些特性，并分析了其营养指标与作物营养含量之间的相关性。结果表明，FAW 在玉米上产卵数量最多，在番茄上产卵数量最少。三龄幼虫的最高取食选择率是在玉米上，而在白菜上则最低。五龄幼虫在玉米上表现出最高的取食选择率，但在其他作物种类上没有显著差异。食物摄入量（FC）、相对生长率（RGR）和近似消化率（AD）在玉米和小麦上显著较高，而在棉花和白菜上，食物摄入效率（ECI）和食物消化效率（ECD）显著较高。FC、相对消耗率（RCR）、RGR 和 AD 与寄主植物的可溶性糖和蛋白质含量呈显著正相关，而 ECI 和 ECD 与可溶性糖含量呈显著负相关。本研究表明，FAW 可能除了玉米之外，还会对这些作物造成潜在的经济损失，这些发现对于管理和控制这种害虫具有重要价值。
