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.

The subject of the performed experiments comprised standard RSMM 110-02, RSMM 110-02 nozzles, AI 110-02, AI 110-02 air induction nozzles as well as AZMM 110-02, AZMM 110-03 low drift nozzles. The working speed during spraying was v_p = 7 km/h. Each sprayer was tested at the following three levels of working pressures: p₁ = 0.2 MPa, p₂ = 0.4 MPa and p₃ = 0.6 MPa. The spray liquid was pure water at the temperature of 20°C. The plant coverage was determined: s_k – spray coverage, n_k – number of droplets per 1 cm² of the leaf.