University of California Cooperative Extension, 669 County Square Drive, Suite 100, Ventura, CA 93003, USA.
J Econ Entomol. 2013 Feb;106(1):80-5. doi: 10.1603/ec12304.
The spider mite, Eotetranychus lewisi (McGregor) (Acari: Tetranychidae), is a new emerging pest in California commercial strawberries. The predatory mite Phytoseiulus persimilis (Athias-Henriot) (Acari: Phytoseiidae), typically used for biocontrol of Tetranychus urticae (Koch) (Acari: Tetranychidae), provided growers little to no control of E. lewisi. Four commonly used phytoseiid predatory mites: P. persimilis, Neoseiulus californicus (McGregor), N. fallacis (Garman), and Amblyseius andersoni (Chant), were used in lab studies to investigate which is best at managing E. lewisi populations. We als o investigated t he interactions between T. urticae and E. lewisi and in relation to phytoseiid efficiency given the potential for indirect effects of biocontrol. When E. lewisi and T. urticae are present on the same leaf, T. urticae populations increase and begin displacing E. lewisi. P. persimilis did not feed on E. lewisi, but the other three predatory mites consumed the spider mites and lowered their populations. When both E. lewisi and T. urticae are present on the same leaf, N. fallacis and A. andersoni fed on both types of mites equally and were capable of decreasing both populations. N. californicus fed on E. lewisi first and decreased its population, but allowed T. urticae populations to increase. P. persimilis may be insufficient at controlling E. lewisi and its use may instead enhance E. lewisi populations.
叶螨，Eotetranychus lewisi（McGregor）（蜱螨目：叶螨科），是加利福尼亚商业草莓中的一种新出现的害虫。捕食性螨虫 Phytoseiulus persimilis（Athias-Henriot）（蜱螨目：植绥螨科），通常用于防治 Tetranychus urticae（Koch）（蜱螨目：叶螨科），对 E. lewisi 的控制作用很小。四种常用的捕食性植绥螨：P. persimilis、Neoseiulus californicus（McGregor）、N. fallacis（Garman）和 Amblyseius andersoni（Chant），在实验室研究中用于调查哪种螨虫最适合管理 E. lewisi 种群。我们还研究了 T. urticae 和 E. lewisi 之间的相互作用以及与植绥螨效率的关系，因为生物防治可能会产生间接影响。当 E. lewisi 和 T. urticae 存在于同一叶片上时，T. urticae 种群增加并开始取代 E. lewisi。P. persimilis 不吃 E. lewisi，但其他三种捕食性螨虫会吃掉这些叶螨并降低它们的种群数量。当 E. lewisi 和 T. urticae 存在于同一叶片上时，N. fallacis 和 A. andersoni 会平等地捕食这两种螨虫，并能够降低这两种螨虫的种群数量。N. californicus 首先捕食 E. lewisi 并降低其种群数量，但允许 T. urticae 种群增加。P. persimilis 可能不足以控制 E. lewisi，其使用可能反而会增强 E. lewisi 的种群数量。
