Effects of Amdro on the Red Imported Fire Ant (Hymenoptera: Formicidae) and Some Nontarget Ant Species and Persistence of Amdro on a Pasture Habitat in North Carolina

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Abstract
A bait, Amdro, containing the toxicant AC217,300 (tetrahydro-5,5-dimethyl-2(1-H)-pyrimidinone[3-[4-(trifluoromethyl)phenyl]-1-[2-[4-(trifluoromethyl)phenyl]ethenyl]-2-propenylidene]hydrazone), was tested for efficacy against the red imported fire ant, Solenopsis invicta Buren, in a pasture in southeastern North Carolina. Significant (P ≤ 0.05) differences in fire ant colony activity and structure were found between treatment and control populations following broadcast (1.7 kg [AI]/ha) and single mound (5 tablespoons per mound) applications. High numbers of incipient fire ant colonies were found in the treated areas of the pasture following the Amdro applications. Deleterious effects on nontarget ant species were not detected. Residues of Amdro were undetectable within 24 h of the broadcast application. Because of the rapid reoccupation of treated areas by incipient colonies, multiple applications of Amdro will be required to achieve long-term suppression of S. invicta populations.