Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
Shandongzhongke Beneficial Insect Resources Utilization Technology Innovation Center, Jinan, Shandong, China.
Exp Appl Acarol. 2023 Aug;90(3-4):267-276. doi: 10.1007/s10493-023-00805-3. Epub 2023 Jun 27.
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 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.
东方钝绥螨（Ehara）（蜱螨目：植绥螨科）是中国果树害螨防治的一种有效捕食螨。近几十年来，它在商业天敌生产中大量生产，以仓储螨（Carpoglyphus lactis（L.））为食。在捕食螨生产过程中，捕食螨与猎物的比例被发现对大规模饲养中东方钝绥螨种群的增加至关重要。在这项研究中，我们研究了东方钝绥螨对不同发育阶段的猎物 C. lactis 的捕食能力，以及猎物数量对捕食者繁殖的影响。在最低的 5 只猎物密度下，东方钝绥螨成虫对 C. lactis 成虫的最大捕食率为每天 2.21 只，在最高的 60 只猎物密度下，对 C. lactis 卵的捕食率为 45.07 只。东方钝绥螨对 C. lactis 卵和成虫的偏好指数 C 分别为 0.4312 和-0.9249，表明东方钝绥螨更喜欢卵而不是成虫。东方钝绥螨可以捕食 C. lactis 的卵或若虫来繁殖。然而，捕食螨的繁殖力并不总是与提供的猎物数量成正比。猎物若虫密度较高导致其繁殖力较低，而猎物卵密度较高则导致东方钝绥螨的繁殖力较高。因此，我们的研究表明，选择合适的猎物密度和发育阶段可以显著提高东方钝绥螨的大规模生产。
