Abstract: (Z)-9-tetradecenyl acetate (A) and (Z,E)-9,12-tetracecadienylacetate (B) were found in sex pheromone gland extracts of female lawn grass cutworm(LGCW), Sidemia depravata,with single gland extract technique by gas chromatography. Field trapping tests were conducted in tall fescue fields in Yangzhou City, Jiangsu Province of eastern China. Baits containing components Aand Bin5 different ratios were tested in the fields for evaluating their attractiveness to male LGCW. Water pool traps with red septa containing5:5 and 6:4 of Aand Bcaught significantly more male LGCW than traps containing 9:1, 8:2 or 7:3 of Aand B.