抄録
Anoplophora malasiaca (Thomson) (Coleoptera: Cerambycidae) male approached the female, touched her with his antennae or tarsi, and then held and mounted her by touching her elytra and pronotum with his palpae. Similar mating attempts by males were confirmed on a glass dummy treated with the solvent extract of female elytra, indicating the presence of a female sex pheromone perceptible by direct contact. When the extract was chromatographed on silica gel, only the hexane fraction showed a weak activity. The activity was apparently enhanced when polar fractions were subsequently mixed with this fraction. Therefore, the sex pheromone consisted of hydrocarbons and polar compounds that operated synergistically. Among more than 40 hydrocarbons identified by GC-MS analysis, only saturated hydrocarbons induced the mating behavior in males.When 8 major authentic hydrocarbons were mixed together with the polar compounds, the blend induced a series of precopulative behaviors in males. Thus, these hydrocarbons were considered to be the components of the sex pheromone in this beetle. Sexual dimorphism was observed in the hydrocarbon profiles. Some hydrocarbons were common between the sexes while others were sexually specific. A blend of male hydrocarbons and female polar components was still active but the opposite combination was inactive. Therefore, polar femalespecific components were critical for revealing the sex pheromonal activity.
