Field Evaluation of Deet and a Piperidine Repellent Against Aedes communis (Diptera: Culicidae) and Simulium venustum (Diptera: Simuliidae) in the Adirondack Mountains of New York
WALTER REED ARMY INST OF RESEARCH WASHINGTON DC DEPARTMENT OF ENTOMOLOGY
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Repellent efficacy of N,N-diethyl-3-methyl-benzamide deet, the piperidine, 1-3-cyclohexen-1-ylcarbonyl-2-methlypiperidine AI3-37220, and a 11 ratio of deet AI3-37220 were evaluated topically 0.25 mgcm2 applied in ethanol solution on human volunteers against the mosquito Aedes communis DeGreer and the black fly Simulium venustum Say. The average repellency of all three formulations was 95 at 4 h. For both mosquitoes and black flies, deet along provided 90 protection at 6 h, whereas AI3-37220 provided 95 protection. Although repellent treatments were not significantly different overall, the contrasts between AI3-37220 versus deet were significant at 6 and 8 h. The 95 confidence interval on percent repellency at 6 h ranged from 90.1 to 98.9 for AI3-37220 versus 64.3 to 82.2 for deet, and at 8 h ranged 76.1 to 88.5 for AI3-37220 versus 47.8 to 64.0 for deet. Similarly, the confidence interval for protection against black flies at 6 h by AI3-37220 ranged from 86.3 to 99.5 and did not overlap with the confidence interval provided by deet along 51.2 to 78.8. There was no evidence of synergistic repellency from a combination of the two compounds i.e., protection from combined compounds was no better than either repellent used alone.
- Agricultural Chemistry