title: Western avocado leafroller,Amorbia cuneana (Walsingham), (Lepidoptera: Tortricidae) : Discovery of populations utilizing different ratios of sex pheromone components.
abstract: The most effective lure for maleAmorbia cuneana (Walsingham) in Orange, Ventura, and Riverside counties of California was previously found to be a 1∶1 ratio of (E,E)-10,12- and (E,Z)-10,12-tetradecadien-1-ol acetates. In subsequent field tests in San Diego and Santa Barbara counties, this lure was ineffective. Analysis of sex pheromone glands (SPG) of femaleA. cuneana from these two counties showed theEE:EZ ratio to be about 1∶9 and synthetic lures of this composition were highly attractive in these areas. Analysis of the SPG of a number of females from both areas showed that there were three population types: two in the low ratio areas possessed 37 and 58%EZ, and the third in the high ratio areas possessed 89%EZ.
authors.affiliation: Department of Entomology, University of California, 92521, Riverside, California.
authors.forename: J B
authors.initials: JB
authors.lastname: Bailey
authors.forename: L M
authors.initials: LM
authors.lastname: McDonough
authors.forename: M P
authors.initials: MP
authors.lastname: Hoffmann