- E8,E10-dodecadien-1-ol, the primary component of the female sex pheromone of codling moth, Cydia pomonella L., has no attraction to male Oriental fruit moth (OFM), C. molesta (Busck). However, this compound when added to the OFM pheromone blend of Z8-dodecenyl acetate (85.5%), E8-dodecenyl acetate (5.5%), and Z8- dodecen -1 -ol (9.0%), acts like a synergist by increasing trap catches of male OFM by two- to three-fold over the OFM blend alone.
In courtyard (semi-field) and flight tunnel tests, several behaviors of OFM males were monitored in response to the three component OFM blend plus E8,E10-dodecadien-1-ol (110/1000 μg) verses the three component OFM blend (110 gg) alone or other combinations of the above components and dodecanol. Increased responses were seen for the OFM blend plus codling moth component for both long range behaviors including wing-fanning before take-off, flight initiation, and upwind flight and close range behaviors such as landing, wing-fanning while walking, hairpencil displays, nearness of approach and copulation attempts with dispensers. Results indicated that substituting E8,E10-dodecadien-1-ol for Z8-12:0H produced equivalent responses. Thus, this codlemone component may replace the main alcohol component of the OFM pheromone. Pheromone from caged, calling virgin female OFM plus E8, E10-dodecadien-1-ol, caused more contacts/landings than did pheromone from caged, calling female OFM alone in flight tunnel tests. The enhanced response of OFM males to the natural pheromone of OFM plus E8,E10-12:0H may indicate that a synergistic effect could occur in the field when the pheromones of OFM and CM co-occur in time and space.
Electroantennograms indicated no significant difference in maximum negative response of male OFM antennae to the three component OFM blend plus E8,E10-dodecadien-1-ol versus the OFM blend alone. Response to E8,E10-dodecadien-1-ol alone was significantly lower than to both other blends.
The synergistic effect of E8,E10-12:0H may be used to increase trapping efficiency and thereby improve population and pesticide resistance monitoring of OFM. The three component OFM blend plus E8,E10-dodecadien-1-ol may be used to improve mating disruption of OFM and to evaluate the success of disruption. The latter would involve the use of "super" traps to monitor OFM males ability to find a pheromone point source within a pheromone permeated orchard.