Medd Nathan C, GreatRex Richard M
Syngenta Bioline Ltd, Telstar Nurseries, Little Clacton, Essex, UK.
Pest Manag Sci. 2014 Oct;70(10):1492-6. doi: 10.1002/ps.3794. Epub 2014 May 8.
Within integrated pest control programmes, the use of high mite inoculations to control hot spots of whitefly is desirable for many growers. In this experiment, two species of predatory mites established as commercial biological control agents, Typhlodromips montdorensis and Amblyseius swirskii (Acari: Phytoseiidae), were compared with another, more recently introduced species, Amblydromalus limonicus, for their ability to control dense populations of greenhouse whitefly (Trialeurodes vaporariorum) on cucumber plants (Cucumis sativus).
Mite formulation type had a significant effect on the number of mites found on plants, but this did not correspond to increased whitefly control. Plots treated with A. limonicus or T. montdorensis, applied as loose product, had significantly reduced whitefly populations throughout the trial. Analysis showed that no species was observed more often on leaves with higher whitefly densities than on those with lower densities.
No species was clearly identified as a suitable candidate for treatment of high-density whitefly colonies, but results suggest the highest level of predation in A. limonicus. Strategies for the effective use of these predatory mite species in control programmes are discussed.
在综合害虫防治计划中，许多种植者希望通过大量投放捕食螨来控制粉虱热点区域。在本实验中，将两种已作为商业生物防治剂的捕食螨，即蒙氏盲走螨和斯氏钝绥螨（蜱螨亚纲：植绥螨科），与另一种最近引入的物种柠檬钝绥螨，就其控制黄瓜植株（黄瓜）上温室粉虱（烟粉虱）密集种群的能力进行了比较。
螨制剂类型对植株上发现的螨数量有显著影响，但这与粉虱防治效果的提高并不对应。在整个试验期间，用松散产品形式施用的柠檬钝绥螨或蒙氏盲走螨处理的地块，粉虱种群数量显著减少。分析表明，在粉虱密度较高的叶片上观察到的螨种类并不比在密度较低的叶片上更多。
没有一个物种被明确确定为高密度粉虱群落处理的合适候选者，但结果表明柠檬钝绥螨的捕食水平最高。讨论了在防治计划中有效利用这些捕食螨物种的策略。
