Department of Entomology & Plant Pathology, 301 Funchess Hall, Auburn University, Auburn, AL 36849, USA.
J Econ Entomol. 2011 Dec;104(6):2009-16. doi: 10.1603/ec11131.
Insecticides are widely used to manage turfgrass pest such as white grubs (Coleoptera: Scarabaeidae). Red imported fire ants, Solenopsis invicta (Buren) are important predators and pests in managed turfgrass. We tested the susceptibility of white grub life stages (adults, egg, and larvae) to predation by S. invicta and determined if insecticides applied for control of S. invicta would result in locally greater white grub populations. Field trials over 2 yr evaluated bifenthrin, fipronil, and hydramethylnon applied to large and small scale turfgrass plots for impacts on fire ant foraging and white grub populations. Coincident with these trials, adults, larvae, and eggs of common scarab species were evaluated for susceptibility to predation by S. invicta under field conditions. Field trials with insecticides failed to show a significant increase in white grub populations resulting from treatment of turfgrass for fire ants. This, in part, may be because of a lack of predation of S. invicta on adult and larval scarabs. Egg predation was greatest at 70% but < 20% of adults and larvae were attacked in a 24 h test. Contrary to other studies, results presented here suggest that fire ants and fire ant control products applied to turfgrass have a minimal impact on white grub populations.
杀虫剂被广泛用于防治草坪害虫，如白土象甲（鞘翅目：象甲科）。红火蚁， Solenopsis invicta （Buren）是管理草坪中的重要捕食者和害虫。我们测试了白土象甲各生命阶段（成虫、卵和幼虫）对红火蚁捕食的敏感性，并确定用于防治红火蚁的杀虫剂是否会导致当地白土象甲种群增加。经过 2 年的田间试验，评估了双丙环虫酯、氟虫腈和噻虫啉在大型和小型草坪上的应用对红火蚁觅食和白土象甲种群的影响。在这些试验的同时，还在田间条件下评估了常见的金龟科成虫、幼虫和卵对红火蚁捕食的敏感性。杀虫剂田间试验未能表明由于对草坪进行红火蚁防治而导致白土象甲种群显著增加。这在一定程度上可能是因为红火蚁缺乏对成虫和幼虫金龟的捕食。在 24 小时的试验中，卵的捕食率最高为 70%，但只有不到 20%的成虫和幼虫受到攻击。与其他研究相反，这里提出的结果表明，用于草坪的红火蚁和红火蚁防治产品对白土象甲种群的影响很小。
