The study aimed to determine the effect of two aphid species; Lipaphis erysimi (Kaltenbach) and Aphis gossypii Glover (Hemiptera: Aphididae) on life table and demographic parameters of Hippodamia convergens Gu`erin-M´eneville (Coleoptera: Coccinellidae). The developmental period of all life stages of H. convergens was shorter when fed on L. erysimi. Net reproductive rate (Ro) was higher (159.85 offspring/individual) on L. erysimi, while it was 87.85 offspring/individual on A. gossypii. Mean generation time (T) was shorter (30.49 d) on L. erysimi than on A. gossypii (45.1 days). Values of the intrinsic rate of increase (r) and finite rate of increase (λ) were calculated as 0.166 days−1 and 1.181 days−1, respectively, on L. erysimi that were higher than on A. gossypii (0.099 days−1 and 1.104 days−1, respectively). Similarly, the survival rate was also higher when the predator was fed on L. erysimi. Overall, the findings suggest using L. erysimi as a better source of prey than A. gossypii for rearing H. convergens.

中文翻译：

---

以两种蚜虫为食时，球虫掠食性物种河豚（Hippodamia convergensGuérin -Méneville，鞘翅目：球藻）的生命表和人口统计参数

该研究旨在确定两种蚜虫的影响。生命表上的Lipaphis erysimi（Kaltenbach）和Aphis gossypii Glover（Hemiptera：Aphididae）的生命表和人口统计参数Gu'erin-M´eneville（Coleoptera：Coccinellidae）。饲喂利什美乳杆菌后，融合菌的所有生命阶段的发育期都缩短了。erysimi的净繁殖率（Ro）较高（159.85个后代/个体），而棉衣曲霉的净繁殖率（Rogo）为87.85个后代/个体。erysimi乳杆菌的平均生成时间（T）短于A. gossypii（45.1天）（30.49 d）。erysimi L. ersimi的内在增长率（r）和有限增长率（λ）的值分别为0.166 days-1和1.181 days-1，比棉铃虫（0.099 days-1）高。和1.104天-1）。同样，捕食天敌L. erysimi时，成活率也更高。总体而言，研究结果表明，在饲养H. convergens时，使用erysimi乳杆菌比A. gossypii更好地捕食。