Major electroantennograph (EAG) activity was associated with five components that were eluted during gas chromatographic fractionation of a sex pheromone extract fromEucosma womonanaKearfott. These components were identified by combined gas chromatograph/mass spectrometry as dodecyl acetate, (Z)-5-dodecenyl acetate, (Z)-7-dodecenyl acetate, (Z,Z)-7,9-dodecadienyl acetate, and (Z,E)-7,9-dodecadienyl acetate. In experiments in the field,E. womonanamales were captured in traps baited with a blend of these five acetates and with a mixture of these acetates and their corresponding alcohols. Males ofIsophrictis similiella(Chambers) also were captured by the acetate blend but not by the mixture of acetates and alcohols. Further experimentation established that addition of either (Z)-7-dodecenol or (Z,E)-7,9-dodecadienol to the acetate blend inhibited capture ofI. similiellabut attractedE. womonana. The best attractant forI. similiellawas a blend of (Z)-5-dodecenyl acetate, (Z)-7-dodecenyl acetate, and dodecyl acetate. Traps placed at a height of 0.3 m caught 6.1-fold moreI. similiellaand 3.0-fold moreE. womonanathan traps at the crop canopy, 1.5 m above ground.