Abstract
Abstract 1. Several insecticides were tested for their ability to induce a water deregulation in the larval migratory locust. All of them provoked an accelerated dehydration (when compared to sham-operated insects). Deltamethrin and baygon were the most potent. 2. This enhanced dehydration due to deltamethrin in adult locust resulted from an increase in the water loss through the feces. This increase was not due to a direct effect of deltamethrin on urine production by the Malpighian tubules but to a hormonal deregulation. 3. Intoxicated insects produced large amounts of the vasopressin-like insect diuretic hormone. This higher synthesis activity occurs within the hours following the insecticide injection and is accompanied by an increase in water loss. 4. These hormonal and metabolic modifications are transient. Hormonal level and diuresis rate both return to the basal levels 7 hr after the insecticide injection.
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