Bed bugs (Cimex lectularius L.) are blood-feeding human ectoparasites.Their cryptic nature and pesticide resistance have led to an upsurge in infestation abundance and increased difficulty to achieve control. A dosage–response study was conducted for fumigation with sulfuryl fluoride against bed bug eggs at 25 and 15°C. The least accumulated dosage that resulted in 100% mortality was then used in a confirmation study in which adults, third-instar nymphs, and additional eggs were fumigated. It was determined that all life stages tested were killed after fumigations at 88.40 and 170.00 g-h/m3, at 25 and 15°C, respectively. These dosages correspond to an application rate of 1.7× (multiplier of the drywood termite rate of 1×). However, sulfuryl fluoride fumigations at 80.08 and 154.00 g-h/m3 (25 and 15°C, respectively) each yielded >99.6% mortality of bed bug eggs, the most fumigant-resistant life stage.These dosages, rounded to the closest tenth, correspond to an application rate of 1.5×. Thus, this study supports that the MasterFume label rate against bed bugs should be decreased from 3× to 1.7×, at the minimum, because fumigation at 1.5× would suffice due to overly conservative estimation of field factors when calculating fumigant dosage.
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Vol. 112 • No. 2