Key Laboratory of Oasis Agricultural Pest Management and Plant Protection Resources Utilization, Xinjiang Uygur Autonomous Region, College of Agriculture, Shihezi University, Shihezi 83200, China.
J Econ Entomol. 2023 Aug 10;116(4):1137-1145. doi: 10.1093/jee/toad094.
Neoseiulus bicaudus (Wainstein) (Acari: Phytoseiidae) is a generalist predatory mite that consumes several pest species, including Tetranychus turkestani (Ugarov et Nikolskii) (Acari: Tetranychidae) in the Xinjiang Uygur Autonomous Region. The release numbers of predatory mites are based on the populations of target pests and their ability to control them. Populations of T. turkestani and T. truncatus Ehara (Acari: Tetranychidae) often coexist and damage many crops. To determine whether the presence of the non-target prey T. truncatus affects the ability of N. bicaudus to control the target prey T. turkestani. The study evaluated the predation rate and functional response of N. bicaudus to 4 stages of T. turkestani in the presence of T. truncatus. The consumption of T. turkestani by N. bicaudus gradually decreased as the proportion of T. truncatus increased. The functional response of N. bicaudus to T. turkestani was not changed when T. truncatus was presented, which was consistent with a type II response. The attack rate of N. bicaudus on the egg, larva, and nymph of T. turkestani was significantly decreased and the handling time of N. bicaudus on T. turkestani was significantly extended when T. truncatus was presented. The preference index showed that the preference of N. bicaudus for eggs and female adults of T. turkestani decreased with increasing density of T. turkestani in the same proportion as T. truncatus. The presence of T. truncatus can negatively affect the predation of T. turkestani by N. bicaudus. We suggest that the number of N. bicaudus released to control T. turkestani should be increased when T. truncatus coexist.
智利小植绥螨（Neoseiulus bicaudus）（蜱螨目：植绥螨科）是一种多食性捕食螨，可捕食包括新疆维吾尔自治区的突厥叶螨（Tetranychus turkestani）（蜱螨目：叶螨科）在内的几种害虫。捕食螨的释放数量取决于目标害虫的种群数量及其控制能力。突厥叶螨和截形叶螨（Tetranychus truncatus）的种群经常共存并损害许多作物。为了确定非目标猎物截形叶螨的存在是否会影响智利小植绥螨控制目标猎物突厥叶螨的能力。本研究评估了智利小植绥螨对存在截形叶螨时 4 个龄期突厥叶螨的捕食率和功能反应。随着截形叶螨比例的增加，智利小植绥螨对突厥叶螨的取食量逐渐减少。当存在截形叶螨时，智利小植绥螨对突厥叶螨的功能反应没有改变，与 II 型反应一致。当存在截形叶螨时，智利小植绥螨对突厥叶螨卵、幼虫和若螨的攻击率显著降低，处理时间显著延长。偏好指数表明，随着截形叶螨与突厥叶螨相同比例密度的增加，智利小植绥螨对突厥叶螨卵和雌成螨的偏好性降低。截形叶螨的存在会对智利小植绥螨捕食突厥叶螨产生负面影响。我们建议，当截形叶螨共存时，应增加释放智利小植绥螨来控制突厥叶螨。
