This study was carried out to identify the sex pheromone of the soybean podworm, Matsumuraeses phaseoli. EAG response of M. phaseoli male antenna to various chemical compounds were examined. Of them, (E,E)-8,10-dodecadienyl acetate (E8E10-12:Ac) and (E)-8-dodecenyl acetate (E8-12:Ac) were most EAG-active. The abdominal tips of M. phaseoli females were extracted with distilled hexane 4h after light-off for 30 min. In an electroantennographic detection (GC-EAD), female extracts showed two EAG-active components. In a GC-MS analysis, three components (E8E10-12:Ac, E8-12:Ac, and (E,Z)-7,9-dodecadienyl acetate) were identical with those of authentic standards following the retention time and their ratio was 7: 1: 1. Of these three components, EAG responses of M. phaseoli males to E8E10-12:Ac and E8-12:Ac were significantly dose-dependent. Field effectiveness of these components remains to be evaluated.

• Ki Hong Yum(Applied Entomology Division, National Institute of Agricultural Science and Technology, RDA)
• Jum Rae Cho(Applied Entomology Division, National Institute of Agricultural Science and Technology, RDA)
• Jin Kyo Jung(Environment and Biotechnology Division, National Institute of Crop Science, RDA)
• Minho Lee(Environment and Biotechnology Division, National Institute of Crop Science, RDA)
• Young Nam Youn(Dept. Applied Biology, College of Agriculture and Life Science, Chungnam National University)