E11-tetradecenyl acetate (E11-14:Ac) was identified as the primary female sex pheromone component of the mimosa webworm,Homadaula anisocentraMeyrick. Chemical analyses by gas chromatography and gas chromatography/mass spectrometry of virgin female sex pheromone gland extracts indicated the presence ofE11-14:Ac,E11-14: OH, and 14:Ac, whereas sex pheromone gland volatiles contained onlyE11-14:Ac and 14: Ac (at approximately 1% ofE11-14:Ac). Gas chromatography-electroantennogram detector analyses indicated male antennal responsiveness to a component in pheromone gland extracts and volatiles that had an elution time coincident withE11-14:Ac. In field-trapping studies,E11-14:Ac elicited trap capture rates not different (P>0.05) from those in traps baited with virgin females. Addition of eitherE11-14:OH or Z11-14:Ac reduced trap capture rates, whereasE- and Z11-14:Ald appeared to have no effect on trap capture rates.