Abstract
The effects of photoperiodic changes on calling behavior and pheromone production in the Oriental tobacco budworm moth, Helicoverpa assulta were investigated. Virgin female moths shifted to continuous dark from 15L:9D as 3-day old adults showed similar temporal patterns of both calling and pheromone production to those of moths held continuously at 15L:9D. This result indicates that both events have a circadian periodicity. When moths were shifted to continuous light at day 3, calling became inactive and irregular, whereas pheromone titers were equal or higher than those of moths under 15L:9D. This result suggests that calling is suppressed while either pheromone production is prolonged or pheromone degradation is suppressed under continuous light.
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