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Adult of cabbage looper, Trichoplusia ni (Hµbner) and corn earworm, Heliothis zea (Boddie) were irradiated with 28, 118, and 337 µm laser emissions, and fall armyworm, Spodoptera frugiperda (J. E. Smith) with the 337 µm emission. When the laser radiation was directed along the longitudinal axis of a plastic tube containing 10 pairs of insects there resulted no significant increase or decrease in the number of insects in the quarter-section of the tube nearest the laser during the 1-h treatment period. Also, pairs of corn earworm maintained in 337 µm radiation displayed mating percentages similar to control groups.