Abstract
The effect of several stimuli on the attraction, landing, and probing by Aedes aegypti (L.) was studied 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 number of mosquitoes found to 1 foot above the source of stimulus in a 10- minute period was quantitated. This estimate of attraction was broken down for counting into 3 parameters: the number of mosquitoes (1) flying, (2) landing on the bottom, and (3) probing toward the stimulus. Heat activated the mosquitoes but did not induce landing. Addition of moisture to heat increased landings and induced some probing. CO2. activated the mosquitoes and in the presence of heat and moisture elicited a few more landings. Moisture and CO2, per se or in combination did not elicit a landing or a probing response from A. aegypti . The maximal attraction as well as landing and probing was obtained with the palm. It is concluded that the maximal attraction and the high incidence of landing and probing by A. aegypti over the palm is due to some “component” of skin emanation other that heat, moisture, or CO2.
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