Degradation rates of some currently marketed United States termiticides are currently being studied. Separate quantities of soil were each treated at lowest label rates with termiticide, and placed in trenches along the inside and outside of concrete walls. Composite soil samples, each consisting of four soil cores, were collected after 1, 30, 60, 120, 180, 240, and 365 days, and again at 2 and 3 years posttreatment. Mean ppm recovered ± SD of eight composite samples after 1 day, and 1, 2, and 3 years respectively, were: Dursban®TC (1.0% AI rate), 924 ±192, 784 ±139, 584 ±129, 469 ±75; Pryfon®6 (0.75%), 782 ±48, 225 ±149, 24 ±29, 33 ±29; Demon®TC (0.25%), 430 ±109, 128 ±42, 64 ±21, 40 ±20; Prevail®FT (0.30%), 353 ±57, 158 ±18, 73 ±21, 61 ±9; Tribute® (0.50%), 681 ±255, 868 ±101, 298 ±57, 171 ±41; Dragnet®FT (0.50%), 471 ±127, 506 ±20, 202 ±44, 184 ±56; Torpedo® (0.50%), 591 ±213, 428 ±39, 182 ±39, 179 ±45; water controls (0.0%), 0.0 ±0.0. Initial AI recoveries were within 95%+ of theoretical ppm. Termites were able to breach some termiticide-treated-soil barriers within 3 years.

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