Concentration-Time Relationship for Fumigant Efficacy of Sulfuryl Fluoride Against the Formosan Subterranean Termite (Isoptera: Rhinotermitidae)

The Formosan subterranean termite, Coptotermes formosanus , was exposed to sulfuryl fluoride over a range of six accumulated concentrations (10-60 mg h/liter) and 12 exposure times (1-96 h), to determine the concentration-time relationship on termite mortality. Time threshold in sulfuryl fluoride fumigation was<1h. The results demonstrated that C0.93t = k was a satisfactory model to describe the response relationship in fumigant efficacy of sulfuryl fluoride against this termite. Because the toxicity index (n = 0.93) approximates to 1, the assumption that the exposure time is equally important to concentration is functionally valid.