Abstract
Field tests in Japan revealed that males of the beet armyworm, Spodoptera exigua (HUBNER), were caught with 70 : 30 and 90 : 10 mixtures of (Z, E)-9, 12-tetradecadienyl acetate (Z9E12-14 : Ac) and (Z)-9-tetradecen-1-ol (Z9-14 : OH). However, no males were caught with a mixture of Z9E12-14 : Ac and (Z)-9-tetradecenyl acetate (Z9-14 : Ac). The best formulation was 0.1-1 mg/rubber septum of the 70 : 30 mixture of Z9E12-14 : Ac and Z9-14 : OH, and it effectively attracted males for more than 1 month. The 90 : 10 mixture at 0.1 mg/septum was as effective as the 70 : 30 mixtures and more males were caught with it than with 3 virgin females 3 to 5 days old.
