A test apparatus was designed to facilitate accurate measurement of termite penetration into termiticide-treated soil; three termiticides at 500 ppm were evaluated. Coptotermes formosanus Shiraki workers tunneled significantly farther into chlordane-treated soil than did Reticulitermes flavipes (Kollar). Both species only slightly penetrated chlorpyrifos-treated soil. Neither species penetrated soil treated with permethrin. After 7 days, termite survival was highest in permethrin tests, presumably because termites avoided contact with treated soil. Survival was lowest in chlorpyrifos tests, which may be attributed to contact toxicity as well as vapor toxicity.

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