The effectiveness of the attractant blend,Z-5- andE-7-tetradecenyl acetates in a microgram ratio of 50:950 for adult males of army cutworm,Euxoa auxiliaris(Grote), was enhanced by the addition of trace quantities (0.13–2.5 εg or 0.013–0.25%) ofZ-7-tetradecenyl acetate, but the addition of 2% of this isomer reduced the trap catches.An alternate specific attractant, developed by field testing highly purified chemicals, consisted of a 3-component blend ofZ-5-,Z-7-, andZ-9-tetradecenyl acetates. In a microgram ratio of 100:1:10 on rubber septa, this attractant was effective in the field for at least 24 days. The trap catches. were reduced as the quantities of theZ-7- orZ-9-tetradecenyl acetates in this blend were increased to 8 and 33%, respectively. The 3-component attractants for the army cutworm were both strongly inhibited by less than 0.4%Z-5-dodecenyl acetate which is the main component of the redbacked cutworm pheromone.