The codling moth,Laspcyresia pomonella(L.), is a polygamous insect. Females collected in blacklight traps and molasses-bait traps in the Yakima, Wash., area over a 3-year period mated an average 1.57 times, 21% mated 3–11 times, and only 7% were unmated. The plural matings implied that the female attracted the male on each occasion by releasing a sex pheromone. Then, if mated females were qualitatively as attractive as virgin females, the special precautions taken to obtain virgin stock for use in sex attractant traps could be eliminated. However, we had also observed that females stopped attracting males immediately after the onset of copulation, which fact would indicate reduced attractancy. This diminution in attractiveness would be of special importance when a male was caged with the females used as lures. A test was therefore made at the Arid Areas Deciduous Fruit Insects Investigations Laboratory, Yakima, to obtain more information about the attractiveness of mated females and the effect males have on the attractiveness of virgin females used as bait in traps.