Human sweat, liquid ammonia, and bovine blood are known to be attractive to some hematophagous flies. These materials were evaluated with and without carbon dioxide (CO2) for their ability to increase capture of female “canyon flies” (Fannia conspicua Malloch) using CDC-type suction traps (without light). Ammonia acted synergistically with CO2 to increase trap catch 89.9% over CO2 alone. There was no synergistic effect of human sweat or bovine blood with CO2. In the absence of CO2, none of the three materials increased trap catch of female canyon flies relative to non-baited traps. Implications for canyon fly control and further trap improvement are discussed.
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Vol. 36 • No. 1