THE ATTRACTION OF THE GRAPE ROOT BORER, VITACEA POLISTIFORMIS (HARRIS) (LEPIDOPTERA: SESIIDAE) TO (E,Z)-2,13 OCTADECADIENYL ACETATE AND THE EFFECTS OF RELATED ISOMERS ON ATTRACTION1

The addition of one (1) percent (Z,Z)-3,13 octadecadienyl acetate to the grape root borer, Vitacea polistiformis (Harris), pheromone, (E,Z)-2,13 octadecadienyl acetate greatly increases capture of males in sticky traps. The numbers collected increased from 3 to 7 times depending on the test, location and time of year. The new blend is sufficiently attractive to provide an effect monitoring system for the species.