Abstract
Attractions of the nontarget noctuids, Orthosia ella and Ochropleura plecta, to the purchasable lure using the sex pheromone of the cabbage armyworm, Mamestra brassicae, which contains (Z)-11-hexadecenyl acetate (Z 11-16Ac), (Z)-11-hexadecenal (Z 11-16Ald), (Z)-11-octadecenyl acetate (Z 11-18 Ac), (Z)-9-hexadecenyl acetate (Z 9-16Ac), and n-tetradecyl acetate (14Ac) in a ratio of 100: 0.1: 2: 0.5: 0.5, were investigated. O. ella males were attracted to Z11-16Ac alone and a mixture of Zl l-16Ac and Z11-16Ald in a ratio of 100: 0.1, but not to those in ratios of 100: more than 0.3. The addition of 14Ac to these components reduced the attraction activity in some degree. O. plecta males were attracted to Z11-16Ac alone and the mixtures of Z11-16Ac and Z11-16Ald in ratios of 100: 0.1-3, particularly more males were attracted to those in ratios of 100: 0.3-1. The addition of Z11-18Ac to these two components made clear the effect of the ratios of these components. The addition of Z 9-16Ac to these components reduced the attraction activity in some degree. Because more M. brassicae males were attracted to mixtures of Z11-16Ac and Z11-16Ald in ratios of 100: 0.1-0.3 than Z11-16Ac alone and other ratio mixtures of those, it is considered that the addition of 0.3% Z1 l-16Ald to Z11-16Ac is suitable method for the suppression of the attraction of O. ella; however, the addition of a disruptant may be needed for that of O. plecta.
