A reinvestigation of the sex pheromone of the eastern spruce bud worm, Choristoneura fumiferana (Clem.), showed that it contains 11-tetradecenal in the ratio 96% trans -: 4% cis -. Field trapping showed the pure trans - compound to be only slightly attractive. Maximum attraction occurred in the range 2% to 5% cis -.
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Sanders et al. (1976) studied this question.