Abstract
Mating behavior of Douglas-fir tussock moth, Orgyia pseudotsugata (McDonnough), is described. Both males and females are capable of mating more than once, with egg fertility remaining the same regardless of number of matings by an individual female. Oviposition occurred ½ to 3 h after mating, and some females interrupted their egg-laying to mate again. Unmated females laid eggs, but these were fewer in number and deposited in aberrant patterns as compared with fertile egg deposition by mated females. Females lived up to 7 days in the field, but attracted fewer males after 3 days. Probability of females successfully mating declined after 1 day. Twenty percent of females used as trap baits failed to attract any males.
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