CHEMORECEPTION IN INSECTS AND THE ACTION OF DDT

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Abstract
An unstabilizing action of DDT on parts of the insect nervous system is illustrated in neurophysiological terms by its conversion of the normal sequence of action potentials from benzene or toluene stimulation to repeating trains of impulses. In behavioral terms this action is taken to account for the 9-fold lowering of tarsal sucrose thresholds of houseflies and blowflies. Thresholds of DDT-resistant flies are not affected, nor are salt or alcohol rejection thresholds of sensitive flies. The role of surface texture in the proboscis reflex is discussed. Evidence is presented showing that DDT itself is a minor attractant.

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