Abstract Prey stage preference, mutual interference, and switching of Amblyseius swirskii Athias-Henriot on Eotetranychus frosti (McGregor) (Tetranychidae) and Cenopalpus irani Dosse (Tenuipalpidae) were evaluated under laboratory conditions on apple leaves. The results of no-choice experiments on the two prey revealed that the predator A. swirskii consumed significantly more eggs than other prey stages. The predator consumed about 46% and 57% of the initial density of eggs of E. frosti and C. irani, respectively. In choice experiments the mean consumption rate of A. swirskii females significantly differed among each of the pests’ life stages. The negative value of the interference coefficient in the mutual interference analysis showed an inverse relationship between the predator density and per capita searching efficiency. The prey preference by predator was not dependent on the relative abundance of prey, as it did not switch from of E. frosti when it became rare to another prey which was more abundant except for the ratio 20E. frosti:60C. irani. The results of this study revealed that A. swirskii could be utilized as an effective predator in the integrated management of E. frosti and C. irani; particularly, its heavy preference for E. frosti could play a considerable role in control of it.

中文翻译：

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Amblyseius swirskii（Acari：Phytoseiidae）对Eotetranychusfrosti（Acari：Tetranychidae）和Cenopalpus irani（Acari：Tenuipalpidae）的捕食阶段偏好、相互干扰和转换

摘要 在实验室条件下，在苹果叶片上评估了 Amblyseius swirskii Athias-Henriot 对霜叶螨 (McGregor) (Tetranychidae) 和 Cenopalpus irani Dosse (Tenuipalpidae) 的捕食阶段偏好、相互干扰和转换。对这两种猎物进行的无选择实验结果表明，捕食者 A. swirskii 消耗的卵明显多于其他猎物阶段。捕食者分别消耗了 E.frosti 和 C.irani 卵初始密度的 46% 和 57%。在选择实验中，A. swirskii 雌性的平均消耗率在害虫的每个生命阶段之间存在显着差异。相互干扰分析中干扰系数的负值表明捕食者密度与人均搜索效率成反比关系。捕食者对猎物的偏好不依赖于猎物的相对丰度，因为当 E.frosti 变得稀有时，它不会从 E.frosti 转换为除比例 20E 外更丰富的其他猎物。霜冻：60C。伊拉尼。这项研究的结果表明，A. swirskii 可以作为一种有效的捕食者，用于综合管理 E.frosti 和 C. irani；特别是，它对 E.frosti 的高度偏好可以在控制它方面发挥重要作用。