Nocturnal Activity of Adults of Three Species of Loopers, 1 Based on Collections in Pheromone Traps

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Abstract
The role of the patterns of adult activity was investigated in the sexual isolation of Trichoplusia ni (Hübner), Pseudoplusia includens (Walker), and T. oxygramma (Geyer) by using field-trapping techniques. T. ni and P. includens females exhibited distinct but overlapping calling periods. Response patterns of males of these 2 species to synthetic pheromone, cis -7-dodecen-1-ol acetate, were closely synchronized with the calling period of the females. However, T. oxygramma males responded uniformly throughout the night to cis -7-dodecen-1-ol acetate. It is, therefore, concluded that differences in nocturnal activity patterns per se are not sufficient to achieve sexual isolation among these 3 species.

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