Sex Pheromones of Noctuid Moths. XXI. Light: Dark Cycle Regulation and Light Inhibition of Sex Pheromone Release by Females ofTrichoplusia ni

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Abstract
Females of Trichoplusia ni (Hübner) synchronized to a 12:12 light :dark cycle at 24°C released sex pheromone only between 5 hours after dark and the end of the dark period. Peak release occurred from 8 to 11 hours after dark. The time of mating appears to be regulated by an endogenous circadian rhythm of female pheromone release. The numbers of females releasing pheromone per night were inversely correlated to light intensities of between 0.3 and 300 lux.