Changing the ratio of Z11-16:Ald and Z11-16:Ac in the binary blend significantly affected the number of T. atristriga caught in traps (Treatment, F1,8 = 5.7, P < 0.04) (Figure ). A significantly higher number of male T. atristriga were caught in traps baited with the binary blend at the ratio of 0.25:0.75 mg than traps bated with the blend containing a 0.5:0.5 mg ratio; no males were caught in traps baited with the binary blend at a ratio of 0.75:0.25 mg (Figure ).