We applied liquid bifenthrin and deltamethrin to topsoil, pine straw, and pea gravel at the labeled rate for controlling ants using a split-split plot design. We placed the treated substrates and respective untreated controls at three locations in Baton Rouge, La. Substrates were destructively sampled immediately and at 24, 48, and 96 h, and at 1, 3, and 6 wks. Substrates were brought into the laboratory, and immediately a bioassay was conducted to determine the mortality of 10 red imported fire ants placed on the substrate. Bifenthrin and deltamethrin was extracted off each substrate, and the amount of remaining chemical was determined using HPLC. Degradation curves were created for each chemical, for each substrate, and for different seasons (early and late spring and mid and late summer).
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