数字农科院2.0

Predatory mite Amblyseius orientalis prefers egg stage and low density of Carpoglyphus lactis prey

文献类型： 外文期刊

作者： Wei, Jiaxing;Liu, Yifan;Sheng, Fujing;Wang, Endong;Zhang, Bo;Xu, Xuenong

作者机构：

关键词： Alternative prey;Predatory capacity;Prey preference;Reproduction

期刊名称： EXPERIMENTAL AND APPLIED ACAROLOGY

ISSN： 0168-8162

年卷期： 2023 年

页码：

收录情况： SCIE（2023版）

摘要： Amblyseius orientalis (Ehara) (Acari: Phytoseiidae) is an effective predatory mite for spider mite control on fruit trees in China. In recent decades, it has been produced massively at a commercial natural enemy producer, feeding on the storage mite Carpoglyphus lactis (L.). In the predator production process, the ratio of predatory mites to their prey was found to be critical for the population increase of A. orientalis in large-scale rearings. In this study, we investigated the predatory capacity of A. orientalis on various developmental stages of the prey C. lactis, and the effect of prey numbers on predator reproduction. The maximum predation rate of A. orientalis adults on C. lactis adults was 2.21 per day at the lowest density of five prey adults, and on C. lactis eggs it was 45.07 at the highest density of 60 prey eggs. The preference index C-i of A. orientalis on C. lactis eggs and adults was 0.4312 and - 0.9249, respectively, suggesting that A. orientalis preferred eggs to adults. Amblyseius orientalis could reproduce when it preyed on either eggs or deutonymphs of C. lactis. However, the fecundity of the predatory mites is not always proportional to the provided prey number. Higher density of prey deutonymphs resulted in lower fecundity, whereas more prey eggs resulted in higher fecundity of A. orientalis. Therefore, our study indicated that the choice of suitable density and developmental stage of prey can significantly improve A. orientalis production on a large scale.

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