The Thermal Aerosol Fog Generator for Large Scale Application of DDT and Other Insecticides

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Abstract
The relatively huge droplets of mechanical sprays, ranging from 40 to 150 u in diam., may each carry many times the adequate lethal dose of an insecticide and be correspondingly wasteful. The unique advantage of the thermal aerosol fog generator (military oil fog generator modified for both ground and airborne operation) lies in particle size which, according to the conditions in each case and for the pest concerned, may range from 10 [mu] to about 50 [mu] in diam. With exceptionally potent insecticides, such as DDT, in combination with high efficiency solvents and carriers, even very small aerosol droplets may carry an adequate lethal dose of the insecticide. Good control of blackflies, punkies, stable flies and houseflies was secured from the application of a 5% soln. of DDT in kerosene at the rate of 0.2 lb. of DDT per acre. A number of details remain to be worked out relative to the most effective balance between particle size, wind velocity, and other factors in the use of aerosol fogs.

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