Method of thin-layer chromatography was used to estimate threshold dosages of diethytoluamide, benzoylhexamethylene, dihexamethylenecarbamide, diethilamide of phenoxyacetic acid and dimethylphthalate for repelling of mosquitoes (Aedes hexodontus, Aedes vexans, Aedes caspius caspius), simuliids (Simulium venustrum), midges (Culicoides obsoletus) and sand-flies (Phlebotomus papatsi). Maximum sensitivity to all the preparations studied was shown by sand-flies (Phlebotomus papatasi, and most sensitive to repellents, out of all the studied species of mosquitoes, were Aedes caspius caspius. Giving recommendations on pellents one must take into consideration the level of sensitivity to repellents of dominating species of blood-sucking arthropods.
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