Abstract
Adults of Hylemya brassicae (Bouche) were observed in the laboratory to obtain data on mating behavior and fertility. Most mating occurred early in the day, and this rhythm was influenced only slightly by exposure to continuous light. Males mated throughout their lives with the peak activity period at age 3 days. There was some loss of fertility in the males with age and mating frequency. The occurrence of a mating pheromone seemed unlikely. Oviposition and inhibition of further matings, normally triggered by copulation, were produced in nonmated females by injections of the male accessory gland substance.
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