抄録
Field ezperiments showed that 1 : 99 to 10 : 90 mixture of (Z)-5-decenyl acetate and (Z)-7-decenyl acetate was the most suitable combination as a lure to catch the male common cutworm moth, Agrotis fucosa BUTLER, at 0.17 to 0.5 mg per rubber septum. The traps baited with the 10 : 90 mixture at 0.5 mg/septum (standard lure) caught 2.5 to 4.6 times more males than the virgin female traps (five 4 to 5-day-old females) for about 1 month. This formulation is considered to be useful as a lure for monitoring population in the field. Maximum attractant activity of the mixture at natural ratio (68 : 32) was obtained at 0.0016 to 0.0075 mg/septum, but it was 42 to 95% of that of the standard lure. With (Z)-5-decenyl acetate by itself, the maximum catches were obtained at 0.005 mg/septum, but they were 54% of those with the standard lure. (Z)-7-Decenyl acetate attracted no male moth at any amount levels by itself. On the contrary, the attractive effect of (Z)-5-decenyl acetate at 0.005 mg/septum was significantly increased with the addition of (Z)-decenyl acetate at 0.05 to 0.5 mg/septum. This is the first instance of the synthetic admixture of two component sex pheromone giving the maximum attraction at a ratio (1 : 99-10 : 90) quite different from the natural ratio (68 : 32).
