DDT Treatment of Airplanes to Prevent Introduction of Noxious Insects

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Abstract
Laboratory and field investigations show that proper DDT residue treatments in airplanes provide effective toxic action against mosquitoes and houseflies for at least 6 weeks under exptl. conditions. Dust treatments are not as satisfactory as sprays from the standpoint of duration of effectiveness, except where applied to upholstered surfaces and this factor together with the unsightliness of the deposit counterbalances the fact that dusts are less laborious to apply than sprays. The best spray treatments in airplanes gave a high % knockdown of mosquitoes and house-flies up to 6 weeks after application with an exposure period of 2 hrs. The airplanes were in regular use during the intervals between tests. The most satisfactory treatment appears to be a 20% conc. of DDT applied as a fine-mist spray. This treatment is suggested as a supplement to the present aerosol treatment. Practical tests are needed in cargo and transport planes making regular flights to determine the effectiveness of DDT residue treatments against all types of noxious insects under all kinds of flying conditions.

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