Repellency of Selected Compounds Against Two Species of Biting Midges (Diptera: Ceratopogonidae: Culicoiddes)1

Abstract

In 2 series of field tests, 4 or 5 selected repellent compounds were evaluated in paired tests with a deet (N,N-diethyl-m-toluamide) standard against the biting midges Culicoides hollensis at Parris Island, South Carolina and C. mississippiensis at Yankeetown, Florida. Repellency was determined in 3 ways: by biting rates on treatments vs nontreatments, by protection time, and by calculating coefficient of protection. Biting rates were most indicative in determining relative effectiveness. Though all repellents tested were effective against both species, 2 compounds, 1-(3-cyclohexen-l-ylcarbonyl)piperidine (AI3-35765) and hexahydro-1-[(2-methylcyclohexyl)carbonyl]-1Hazepine (AI3-35770), were found to be substantially more effective than the others as well as the deet standard.