A rate of 5 mg/h/ha of (Z)-11-tetradecenyl acetate either alone or combined with other chemicals, completely disrupted the orientation ofArgyrotaenia velutinanamales to pheromone baited traps in small plots, but was not very effective withChoristoneura rosaceanamales. A mixture of (Z)-11- and (E)-11-tetradecenyl acetate and (Z)-11- and (E)-11-tetradecenyl alcohol at a rate of 5 mg/h/ha for each chemical was the most effective againstC. rosaceanamales although it was not significantly better than a mixture of just the 2 isomers. Z11-14:OH and Z11–14:formate tested individually at rates of 5 mg/h/ha poorly disrupted the orientation of males of either species.