Relative Effectiveness of Repellents Against Simulium Damnosum (Diptera: Simuliidae) and Glossina Morsitans (Diptera: Glossinidae) in Ethiopia1

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Abstract
Field tests were conducted on the relative effectiveness of 9 chemicals used as skin repellents against Simulium damnosum Theobald and Glossina morsitans Westwood in Ethiopia. At 10% concentrations, N -butyryl-1,2,3,4-tetrahydroquinoline and N,N -diethyl- m -toluamide (deet) were superior against S. damnosum , being significantly more active than lndalone, ethyl hexanediol, O -ethoxy- N,N -diethylbenzamide, O -chloro- N,N -diethylbenzamide, dimethyl phthalate and 2,2,4-trimethyl-l,3-pentanediol, which were of about equal potency. Dimethyl carbate was least effective. When used at 40% concentrations, N -butyryl-1,2,3,4-tetrahydroquinoline and O -ethoxy- N,N -diethylbenzamide afforded protection for more than 10 hr. None of the repellents, when tested at 50% concentrations against G. morsitans , provided protection for more than 2-1/2 hr. Ethyl hexanediol and dimethyl carbate were active for the longest period, while dimethyl phthalate, O -ethoxy- N,N -diethylbenzamide and O -chloro- N,N -diethylbenzamide afforded least protection.

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