Action of a Repellent as Indicated by a Radioactive Tracer

Autor: Bar-Zeev, Micha, Schmidt, Claude H.
Zdroj: Journal of Economic Entomology; April 1959, Vol. 52 Issue: 2 p268-268, 1p
Abstrakt: P32-phosphoric acid was used as a tracer in experiments with Aedes aegypti (L.) feeding through a membrane on citrated blood. When diethyltoluamide was present in the blood at a concentration that prevented the mosquitoes from engorging, the mosquitoes barely touched the membrane and did not insert their pro- boscises into the blood. When the concentration was lowered to one that allowed about half the mosquitoes to become engorged, those that did not feed spent slightly more time in contact with the membrane, and about a third of them inserted their proboscises into the blood but did not imbibe. It was concluded that most of the repellency was due to vapor action but at a low concentration contact chemoreceptors on the labella may have been involved.
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