The kairomone, ethyl (2E,4Z)-2,4-decadienoate, a potent attractant of both males and females of Cydia pomonella in regions of the USA, was tested alone and together with the synthetic sex pheromone in apple orchards of Bulgaria in 2002 and 2003. No female moths were caught in any trap containing kairomone as a lure or lure component. Furthermore, traps baited with kairomone caught only low numbers of males. Greatest numbers of male moths were caught in traps baited with the “combined-lure,” comprised of pheromone and kairomone together.