Improved Deposits for Controlling Insects Outdoors1

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Abstract
The residual effectiveness on outdoor foliage of both nonvolatile (DDT) and volatile (lindane and aldrin) chlorinated organic insecticides, alone and in combination with a chlorinated terphenyl was determined. This was done by spraying methyl ethyl ketone solutions of the insecticide mixtures on pine branches outdoors and periodically collecting twigs for indoor tests on Musca domestica. DDT was also applied in fuel oil and in an emulsion for comparative purposes. It was found that a chlorinated terphenyl greatly extended the residual life of lindane and aldrin but DDT was not helped. Surface residues from methyl ethyl ketone solutions of DDT lasted longer, however, than fuel oil applications. The problem of applying insecticides in highly volatile solvents was apparently overcome by the use of very concentrated solutions of insecticide and chlorinated terphenyl. Evaporation of a small amount of the solvent left semisolid spheres about 100 [upsilon] in size, which dispersed well and adhered tenaciously, without penetration of the surface on which they landed.

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