Seven of 17 insecticides tested as conventional aerosols were effective against a susceptible strain of house flies, Musca domeslica L., producing 90% or more mortality at a distance of 150 ft from the generator. Of the seven, three were equally effective as low-volume aerosols. Diazinon was the most effective of the conventional aerosols, and Dursban® (0,0-diethyl 0-(3,5,6-trichloro-2-pyridyl) phosphorothioate) was the most effective low-volume aerosol. However, none of the compounds was effective as a conventional or low-volume aerosol against an insecticide resistant strain of flies.