GC and GC-EAD analysis of headspace volatiles collected from Epitrix fuscula (Coleoptera: Chrysomelidae) feeding on eggplant leaves revealed seven potential male-specific pheromone components. The most abundant of these was (2E,4E,6Z)-2,4,6-nonatrienal, a chemical not previously reported in insects. The other minor components were sesquiterpenes that have been found in the male emissions from other flea beetle species. Chemical identifications were by spectra, microchemical reactions, and comparison to standards. (2E,4E,6Z)-2,4,6-nonatrienal was synthesized and matched the natural compound by GC retention time, spectra, and GC-EAD response. In a field test, the synthetic aldehyde attracted significantly more eggplant flea beetles than unbaited traps alone.