Insecticides for Suppression of Nylanderia fulva

Nylanderia fulva (Mayr) is an invasive ant that is a serious pest in the southern United States. Pest control operators and homeowners are challenged to manage pest populations below acceptable thresholds. Contact and bait insecticides are key components of an Integrated Pest Management (IPM) strategy, however, little is known about their efficacy. In repellency and efficacy bioassays, N. fulva were not completely repelled by any insecticide tested, although fewer ants crossed a surface treated with Temprid(®). Few insecticides provided rapid control. Termidor(®) and Temprid(®) were the best performing with mean mortality of 100% in 13.4 and 19.0 days, respectively. In no-choice bait acceptance studies, it was shown that N. fulva generally had greater acceptance of carbohydrate-based ant baits (Advion(®), InTice(TM) (gel), and InTice(TM) (granular)). However, mortality was low for the InTice(TM) baits in a 7-day bioassay. Maxforce(®) Ant Killer Bait Gel and Advance(®) 375A in the spring and Maxforce(®) Complete in the summer and fall required the fewest days to reach 100% mortality. Bait active ingredients that resulted in the highest mortality were hydramethylnon and fipronil. These data on the efficacy of commercially available contact and bait insecticides provide valuable information to manage this invasive pest.