The female azuki bean beetle, Callosobruchus chinensis L., a worldwide notorious pest of azuki beans produces sex pheromone having two isomer compounds; (2Z,6E)-7-ethyl-3,11-dimethyl-2,6,10-dodecatrienals (2Z-homofarnesal) and (2E,6E)-7-ethyl-3,11-dimethyl-2,6,10-dodecatrienals (2E-homofarnesal). We synthesized and evaluated the attractiveness of different blends of the two isomeric compounds using Y-olfactometry in laboratory and rocket traps in the field. The attractiveness pattern of the tested blends in Y-olfactometry was found as 1:9≥6:4>9:1 of 2E-:2Z-homofarnesal. Under field condition also, the 6:4 blend was more attractive than 9:1 blend. The result ascertained the enhanced pheromonal activity of homofarnesal with the increased ratio of Z-component in the blend. This provides an opportunity to synthesize Z-rich homofarnresal with less sophisticated and economically feasible Z-selective method.

• Kashinath Chiluwal(Division of Applied Life Science (BK21+ Program)/ Institute of Agriculture and Life Science, Gyeongsang National University NepalAgriculturalResearchCouncil (NARC))
• Junheon Kim(Forest Insect Pests and Disease Division, National Institute of Forest Science)
• Soon Do Bae(Department of Southern Area Crop Science, National Institute of Crop Science, Rural Development Administration)
• Chung Gyoo Park(Division of Applied Life Science (BK21+ Program)/ Institute of Agriculture and Life Science, Gyeongsang National University)