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Toxicity and repellency of potting soil treated with bifenthrin and tefluthrin to red imported fire ants (Hymenoptera: Formicidae)

Oi, D.H., Williams, D.F.
Journal of economic entomology 1996 v.89 no.6 pp. 1526-1530
Solenopsis invicta, bifenthrin, tefluthrin, toxicity, lethal dose, soil treatment, insect control, chemical control, quarantine
The LC50, and LC90 of bifenthrin in potting soil for female elates of the red imported fire ant, Solenopsis invicta Buren, were 1.1 and 5.2 ppm, respectively. For tefluthrin, the LC50 and LC90 were 8.5 and 19.0 ppm, respectively. These results may provide a basis for setting minimum levels for the enforcement of quarantine regulations. Pots filled with soil treated with either bifenthrin or tefluthrin at the label rate of 25 ppm were exposed to small colonies of S. invicta without alternative nesting sites. After 48 h, 6% of the bifenthrin-treated pots and 24% of the tefluthrin-treated pots were considered infested under quarantine standards. When exposure was lengthened to 2 wk, all pots were uninfested. Implications for the imported fire ant quarantine program are discussed.