Abstract
Nine commercially manufactured ultrasound pest control devices were evaluated for acoustical characteristics and for efficacy against German cockroaches, Blattella germanica (L.), and oriental rat fleas, Xenopsylla cheopis Rothschild. All devices tested produced ultrasound, but the quality of the sound differed for each device. German cockroaches entered ultrasound-treated rooms as readily as they did untreated rooms. Field efficacy testing demonstrated that German cockroach populations were not significantly reduced in ultrasound-treated apartments. Oriental rat fleas were capable of mating, oviposition, larval development, and pupation when reared in ultrasound-treated rooms. Results indicate that manufacturer claims of cockroach and flea control with ultrasound devices cannot be substantiated.
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