Quantitation of Effect of Several Stimuli on the Approach of Aedes aegypti1

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Abstract
The effects of several stimuli on the approach of Aedes aegypti (L.) were studied at 5 different heights in a specially constructed tower. The stimuli studied were heat (34°C), water vapor, carbon dioxide, and combinations of these. The human palm was studied as a natural source of attractive stimuli. The approach of mosquitoes to different stimuli was quantitated and compared. The number of mosquitoes approaching the palm was maximal compared with other stimuli at all heights; they also came down faster and in maximum numbers. The number of mosquitoes attracted to the palm rose continuously and steadily with time. The mosquitoes approached the palm from distances greater than those from which they approached other stimuli. The study suggests that heat and CO2 are important for the approach of mosquitoes to the host at close proximity, but at greater distance odor seems to be more important in the hierarchy of attractive stimuli.

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