Department of Entomology, Newe-Ya'ar Research Centre, Agricultural Research Organization (ARO), Ramat Yishay, Israel.
Department of Environmental and Evolutionary Biology, University of Haifa, Haifa, Israel.
Pest Manag Sci. 2019 Feb;75(2):405-412. doi: 10.1002/ps.5129. Epub 2018 Sep 11.
Several phytoseiid species can potentially control the citrus rust mite (CRM). Their effectiveness varies, however, as do their intraguild interactions. Under laboratory conditions, Euseius stipulatus, E. scutalis and Iphiseius degenerans preyed effectively on CRM, whereas Amblyseius swirskii and Typhlodromus athiasae had no effect on CRM. In combination with A. swirskii, Euseius numbers were reduced due to intraguild predation, and consequently CRM suppression was less effective. In the field, predatory mite species can be variably provisioned by windborne pollen released from cover crops such as Rhodes grass (RG). We aimed to determine the effects of RG on the phytoseiid community in two field experiments, on different cultivars (pomelo and Shamouti orange). We also tested these communities for negative interspecific abundance relationships that are expected if their respective laboratory-observed intraguild interactions are manifested in the field.
Overall, on pomelo, we observed a dominance of A. swirskii, relatively low E. stipulatus and high CRM abundances. Amblyseius swirskii and E. stipulatus abundances were both elevated near RG, despite apparent intraguild predation by A. swirskii. Conversely, T. athiasae abundances were lower near RG, likely due to predation by A. swirskii. On Shamouti, E. stipulatus abundances were much higher than on pomelo and were not negatively related to A. swirskii abundances. There, RG increased E. stipulatus abundance, and CRM was reduced.
RG cover cropping can enhance CRM control, depending on variation in intraguild interactions among phytoseiids, particularly between A. swirskii and E. stipulatus. These may be modulated by climatic and/or cultivar effects. © 2018 Society of Chemical Industry.
几种捕食螨物种有可能控制柑橘锈螨（CRM）。然而，它们的有效性因种间相互作用而异。在实验室条件下，Euseius stipulatus、E. scutalis 和 Iphiseius degenerans 有效地捕食 CRM，而 Amblyseius swirskii 和 Typhlodromus athiasae 对 CRM 没有影响。与 A. swirskii 结合使用时，由于种内捕食，Euseius 数量减少，因此 CRM 的抑制效果较差。在野外，捕食性螨虫的物种可以通过风传播的花粉得到不同程度的供应，这些花粉是由覆盖作物（如罗德斯草（RG））释放的。我们旨在确定 RG 在两个田间实验中对不同品种（柚子和椪柑）的捕食螨群落的影响。我们还测试了这些群落中是否存在负的种间丰度关系，如果它们在实验室观察到的种内相互作用在野外表现出来的话。
总体而言，在柚子上，我们观察到 A. swirskii 的优势，E. stipulatus 的相对较低和 CRM 的高丰度。尽管 A. swirskii 明显存在种内捕食，但 A. swirskii 和 E. stipulatus 的丰度都在 RG 附近升高。相反，T. athiasae 的丰度在 RG 附近较低，可能是由于 A. swirskii 的捕食。在椪柑上，E. stipulatus 的丰度远高于柚子，并且与 A. swirskii 的丰度没有负相关关系。在那里，RG 增加了 E. stipulatus 的丰度，并且降低了 CRM。
RG 覆盖作物可以增强 CRM 的控制，这取决于捕食螨之间的种内相互作用的变化，特别是 A. swirskii 和 E. stipulatus 之间的变化。这些可能受到气候和/或品种效应的调节。 © 2018 化学工业协会。
