A Simple Exhaust Aerosol or Spray Generator for Dispersing Insecticide Solutions1

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Abstract
The need for simple, efficient equipment to disperse insecticides for mosquito control during the war led to the development of an exhaust aerosol or spray generator which could be used on readily available motor vehicles. The equipment consists of an insecticide reservoir, a control valve with indicating dial, a length of flexible hose, a simple clamp cutout and a sheet-metal venturi nozzle which is clamped on the exhaust stack of the engine. Insecticide solns. and emulsions made up in both high and low boiling solvents have been successfully applied with the equipment. The principal uses of the equipment up to the present time have been for fly and mosquito control with DDT solns. around public gathering places, drainage ditches, swamps, dairies, airplane hangers, auditoriums, and barracks. Recently it has been used successfully for dis- persing chlorinated hydrocarbons for the control of the grasshoppers, Melanoplus differentialis and M. femur-rubrum, in Illinois. A detailed description is given of the equipment, its installation and the method of operating it when installed on the jeep. A similar devise installed on the exhaust of light airplanes is also described. Suggestions are made on the usefulness of these devises for dispersing insecticides for the control of other insects, including agric. pests.

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