Abstract
EAG-active compounds in the virgin female extract of an olethreutid moth, Strepsicrates semicanella (Walker) (Lepidoptera: Tortricidae), were identified as (Z)-7-dodecenyl acetate (Z7-12:Ac) and (Z)-7-dodecen-1-ol (Z7-12:OH) by comparison of retention values measured by GC-EAG analyses, and only the former compound was confirmed to show attractiveness. The amounts of these compounds were estimated to be less than the noise level (<30 pg/female), since corresponding GC peaks were not observed. In the field, males were captured with traps baited with Z7-12:Ac but not with Z7-12:OH. The attractiveness of Z7-12:Ac was slightly increased by blending with Z7-12:OH, but the difference was not significant. Nevertheless, it was decided to use the 90 : 10 blend of Z7-12:Ac and Z7-12:OH for field attraction because of the clear EAG activity of Z7-12:OH. The 90 : 10 blend showed maximum attractions at 0.5–5 μg when loaded on rubber septa. GC-EAG analyses suggested the presence of dodecyl acetate and dodecan-1-ol in the extract, but these compounds showed neither a synergistic nor inhibitory effect on male attraction in the field. The unusually low optimum doses for male attraction suggest that communication disruption would be effective for control of this insect pest.
