Epicuticular components from the surface of flag leaves and ears of the triticale cultivars were identified by combined gas chromatography/mass spectrometry. After separating dichloromethane extracts of flag leaves and ears, the major chemicals of the LAD 898 cultivar were 14,16- hentriacontanedione (39.01 V40.21%) and lauric acid 2-(hexadecyloxy)-3-(octadecyloxy) propyl ester (15.22%-23.02%), while waxes of flag leaves and ears of MSx366 contained a high percentage of octacosane and triacontane. The results presented here suggest that 14,16-hentriacontanedione and lauric acid 2-(hexadecyloxy)-3-(octadecyloxy) propyl ester might be responsible for resistance of waxy triticale to the grain aphid.