Abstract

Micraspis discolor (F.) is a highly abundant species of ladybird that is used as a potential biocontrol agent against plant pests. We studied the biology, life table parameters, and molecular characterization of M. discolor. In addition, we studied its predatory potential against Aphis gossypii Glover. The net reproductive rate (R₀) based on the development stage and two-sex life table was 21.61 eggs/individual. The rate of consumption increased with progress in each stage of the development. Compared to the other larval stages of the predator, the fourth stadium consumed the highest number of A. gossypii nymphs (123.72). Both females (956.6) and males (1221.5) consumed more prey (nymphs) than the larvae. The net consumption rate of M. discolor was 694.04 nymphs of A. gossypii. The mitochondrial cytochrome oxidase subunit 1 (CO-I) gene was successfully sequenced from M. discolor. We used only the 514 bp length sequence for diversity analysis, with no character variable or insightful parsimony. Based on the results obtained, we conclude that M. discolor could be used as a biological control agent against A. gossypii.

摘要

Micraspis discolor (F.) 是一种高度丰富的瓢虫物种，可用作植物害虫的潜在生物防治剂。我们研究了M. discolor的生物学、生命表参数和分子特征。此外，我们研究了它对Aphis gossypii Glover 的捕食潜力。基于发育阶段和两性生命表的净繁殖率（R _{0 ）为21.61 卵/个体。}消费率随着每个发展阶段的进步而增加。与捕食者的其他幼虫阶段相比，第四个体育场消耗了最多的A. gossypii若虫 (123.72)。雌性 (956.6) 和雄性 (1221.5) 比幼虫消耗更多的猎物（若虫）。变色棉蚕的净消耗率为棉棉若虫694.04只若虫。线粒体细胞色素氧化酶亚基1（CO-I）基因被成功测序为M. discolor。我们只使用 514 bp 长度的序列进行多样性分析，没有特征变量或有见地的简约。基于获得的结果，我们得出结论，M. discolor可以用作对抗棉絮虫的生物防治剂。