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1 December 2011 Lack of Interactions between Fire Ant Control Products and White Grubs (Coleoptera: Scarabaeidae) in Turfgrass
S. Addison Barden, David W. Held, L. C. ‘Fudd’ Graham
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Insecticides are widely used to manage turfgrass pest such as white grubs (Coleoptera: Scarabaeidae). Red imported fire ants, Soknopsis 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.

©2011 Entomological Society of America
S. Addison Barden, David W. Held, and L. C. ‘Fudd’ Graham "Lack of Interactions between Fire Ant Control Products and White Grubs (Coleoptera: Scarabaeidae) in Turfgrass," Journal of Economic Entomology 104(6), 2009-2016, (1 December 2011).
Received: 26 April 2011; Accepted: 1 September 2011; Published: 1 December 2011

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