Osman Ibrahim, Wang Zhimin, Li Ertao, Feng Honglin, Yin Jiao, Liang Gemei, Liu Zhengling, Ning Dekai, Li Kebin, Xie Yonghui
State Key Lab for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
Dept of Entomology, 404 Life Sciences Building, Louisiana State Univ Agricultural Center, Baton Rouge, USA.
Neotrop Entomol. 2025 Sep 10;54(1):93. doi: 10.1007/s13744-025-01307-0.
Successful biological control requires accurate knowledge of the host preference of the released parasitoid. Telenomus remus Nixon (1973) is an effective parasitoid of Spodoptera frugiperda (J.E. Smith) in many regions, but S. frugiperda is not ideal for mass rearing due to cannibalism and high feeding costs. This study evaluated the efficacy of T. remus by assessing parasitization and emergence rates on eggs of S. frugiperda and Spodoptera litura (Fabricius). Host preference was tested through choice and non-choice experiments using parasitoids reared on both hosts, and various host-parasitoid ratios were tested to assess density-dependent parasitism. Results showed that T. remus had higher parasitism and emergence rates on S. litura eggs, regardless of the rearing host. The highest parasitism was observed on S. litura (94.63%) from T. remus reared on S. litura eggs and the highest emergence rates was also on S. litura eggs from T. remus reared on S. frugiperda (88.03%). The lowest emergence rate (52.29%) was observed on S. frugiperda eggs under no-choice conditions. Parasitoids reared on S. frugiperda achieved the highest parasitism on S. litura eggs (98.11%) in host-parasitoid ratio tests, while the lowest emergence rate (55.02%) occurred when reared and tested on S. frugiperda. These results suggest that S. litura is a more suitable host for mass rearing T. remus, enhancing its potential as a biological control agent in the field.
成功的生物防治需要准确了解所释放寄生蜂的寄主偏好。雷氏泰勒小蜂（Telenomus remus Nixon，1973）在许多地区是草地贪夜蛾（Spodoptera frugiperda (J.E. Smith)）的有效寄生蜂，但由于同类相食和高饲养成本，草地贪夜蛾并不适合大规模饲养。本研究通过评估雷氏泰勒小蜂对草地贪夜蛾和斜纹夜蛾（Spodoptera litura (Fabricius)）卵的寄生率和羽化率来评价其防治效果。通过使用在两种寄主上饲养的寄生蜂进行选择和非选择实验来测试寄主偏好，并测试了各种寄主 - 寄生蜂比例以评估密度依赖性寄生。结果表明，无论饲养寄主如何，雷氏泰勒小蜂对斜纹夜蛾卵的寄生率和羽化率更高。在以斜纹夜蛾卵饲养的雷氏泰勒小蜂中，观察到对斜纹夜蛾的最高寄生率为94.63%，而在以草地贪夜蛾饲养的雷氏泰勒小蜂中，对斜纹夜蛾卵的最高羽化率也为88.03%。在非选择条件下，观察到草地贪夜蛾卵的最低羽化率为52.29%。在寄主 - 寄生蜂比例测试中，以草地贪夜蛾饲养的寄生蜂对斜纹夜蛾卵达到了最高寄生率（98.11%），而当在草地贪夜蛾上饲养和测试时，羽化率最低（55.02%）。这些结果表明，斜纹夜蛾是大规模饲养雷氏泰勒小蜂更合适的寄主，提高了其作为田间生物防治剂的潜力。
