(E,E)-8,10-dodecadienyl acetate (E8E10-12:Ac) and (E)-8-dodecaenyl acetate (E8-12:Ac) have been selected as the candidate chemicals for sex pheromone components of the M. phaseoli, female through GC-EAD tests, whereas the two compounds and an additional candidate, (E,Z)-7,9-dodecadienyl acetate (E7Z9-12:Ac), have been found at a ratio of 7:1:1 in the abdominal tip extract (Yum et al., 2008). In order to determine the actual composition of sex pheromone, therefore, several blends using the three chemicals were evaluated for attractiveness to males of M. phaseoli around red bean and soybean fields. Individual components as well as two blends consisted of E8E10-12:Ac/E7Z9-12:Ac and E8-12:Ac/E7Z9-12:Ac did not show attractiveness, whereas the blend of E8E10-12:Ac/E8-12:Ac showed an increased effect in male capture. Of the tested blends with all three chemicals, the 7:1:2 composition of E8E10-12:Ac, E8-12:Ac and E7Z9-12:Ac attracted the most number of males. The results suggested that E7Z9-12:Ac is one of the sex pheromone components and may act as a synergist.

• Ki Hong Yum(Applied Entomology Division, National Academy of Agricultural Science, RDA, Dept. Applied Biology, College of Agriculture and Life Science, Chungnam National University)
• Jum Rae Cho(Applied Entomology Division, National Academy of Agricultural Science, RDA)
• Jin Kyo Jung(Crop Environment and Biotechnology Division, National Institute of Crop Science, RDA)
• Bo Yoon Seo(Crop Environment and Biotechnology Division, National Institute of Crop Science, RDA)
• Chang-Gyu Park(Applied Entomology Division, National Academy of Agricultural Science, RDA)
• Young Nam Youn(Dept. Applied Biology, College of Agriculture and Life Science, Chungnam National University)