Abstract
A practical airplane unit for the production of DDT aerosols for anopheline larval control has been developed which is simple, inexpensive, and readily adapted to certain types of available aircraft. The factors determining the particle size of the DDT aerosols produced have been analyzed and formulated for the practical application to the design of equipment. This analysis appears to conform closely to the basic theory of liquid atomization by gas streams. The characteristics of aerosol distribution with regard to swath width, penetration of vegetation, and min. dosage for larvicidal effectiveness have been analyzed and formulated for field use. The results indicate that aerosols having a mass median diameter of 25-50 microns are best suited for the control of A. quadrimaculatus larvae under conditions encountered on impounded waters.

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