The relative attractiveness of three binary blends containing various ratios of Z11-16:Ald and Z11-16:Ac were field-tested in the same organic apple orchard used in Trial 1, during three weeks in February 2014. The ratios of Z11-16:Ald and Z11-16:Ac in the binary blends were 75:25, 50:50 and 25:75. In all binary blends, the total loading of the two compounds was 1mg. Traps baited with a blank lure were used as controls.