Size of Aerosol Droplets Impinging on Mosquitoes as Determined with a Scanning Electron Microscope1

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Abstract
A procedure was developed whereby aerosol droplets of soybean oil (used to simulate undiluted insecticide) that impinged on Aedes taeniorhynchus Wiedemann were observed and photographed with a scanning electron microscope. Few droplets occurred on mosquitoes exposed outdoors, but mosquitoes exposed in wooden chambers had droplets on all sections of their body surface. Highest concentrations were on the wings and antennae. On mosquito wings, droplets ranging in size from two to 16 microns impinged with more efficiency than smaller or larger droplets. All droplets of soybean oil on mosquitoes exposed outdoors measured one to eight microns.

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