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The Effectiveness of Permethrin and Deet, alone or in Combination, for Protection against Aedes Taeniorhynchus^*

C. E. Schreck, D. G. Haile AND D. L. Kline

Field tests were conducted to compare the degree of protection from bites by the mosquito Aedes taeniorhynchus (Wiedemann) provided by wearing clothing treated with permethrin [(3-phenoxyphenyl)methyl (±) cis/trans 3-(2-dichloroethenyl)2, 2-dimethylcyclopropanecarboxylate] with that provided by applying deet (N,N-diethyl-m-toluamide) to exposed skin or by applying deet and wearing the treated clothing. Human test subjects were exposed to natural populations of mosquitoes for a 9-hour daytime period (total of 8 days/treatment) while using one or both protection methods. Unprotected test subjects were also exposed for short periods each day as a check to determine the overall biting rate of mosquitoes. The combined use of both protection methods was the most effective treatment in preventing bites, resulting in an average of 1.5 bites/9-hour day, compared with 53.5 and 98.5 bites on subjects protected only with treated clothing or deet, respectively, and 2, 287 bites (extrapolated) on subjects who wore untreated clothing during the same time period. Measurements also indicated that the toxic effect of permethrin reduced biting rates by > 90% within the immediate area where subjects wore permethrintreated uniforms for 9 hours.

Accepted for publication December 13, 1983.

^* This paper reports the results of research only. Mention of a pesticide does not constitute a recommendation for use by the U.S. Department of Agriculture, nor does it imply registration under FIFRA as amended. Tests with human volunteers were approved by the University of Florida, University Committee for the Protection of Human Subjects, in accordance with procedures for human testing given in Section 46–103 (b), Federal Register, Vol. 41, No. 125, 28 June 1976.

Research reported here was conducted in part with contract funds from the U.S. Army Medical Research and Development Command, Ft. Detrick, Frederick, Maryland.

Address reprint requests to: C. E. Schreck, Insects Affecting Man and Animals Research Laboratory, ARS, USDA, P.O. Box 14565, Gainesville, Florida 32604.

Research Entomologist.

Agricultural Engineer.