Abstract
Aerosols of fine particle size (2 to 5 microns m.m.d.) were found to be about as good as those of coarse particle size (15 to 20 microns m.m.d.). The important factor was the concentration of insecticide dispersed per unit volume of air. The nonvolatile content of an aerosol formulation is not of much importance as long as the spray droplets do not exceed the aerosol range. On this basis, concentrated aerosol formulations were prepared containing up to 10% of active ingredient (allethrin) with no other adjuvants and these were found to be highly effective on nonresistant and resistant house flies.
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