THE SCARAB BEETLE ANOMALA-ALBOPILOSA-SAKISHIMANA UTILIZES THE SAME-SEX PHEROMONE BLEND AS A CLOSELY-RELATED AND GEOGRAPHICALLY ISOLATED SPECIES, ANOMALA-CUPREA

Two components were identified in the sex pheromone system of the gree n chafer, Anomala albopilosa sakishimana Nomura: (R,Z)-5-(-)-oct-1-eny l)oxacyclopentan-2-one (buibuilactone) and (R,Z)-5-(-)-(dec-1-enyl)oxa cyclopentan-2-one (japonilure), which have been previously identified as sex pheromone constituents of A. cuprea and A. octiescostata. A fem ale-specific minor component, (R,E)-5-(-)-(oct-1-enyl)oxacyclopentan-2 -one, did not seem to be involved in pheromonal communication because it was not EAD active, but its role remained unclear. A synthetic blen d of the two components captured significantly more beetles than any o ther treatments. Nevertheless, the fact that both the synthetic sex ph eromone and field-captured female beetles were weak lures convinced us that the sex pheromone system may be only part of a complex communica tion system, probably involving plant volatiles. Although the sex pher omone was released during both the scotophase and photophase, there wa s an increase of 60% in the photophase.