In Grapholitha molesta (Busck), the Oriental fruit moth, the behavioral effects of 3 female sex pheromone components, (Z)-8-dodecenyl acetate (Z8-12:Ac), (E)-8-dodecenyl acetate (E8-12:Ac), and (Z)-8-dodecenyl alcohol (Z8-12:OH), are described most precisely only when each component is considered in combination with the other two, rather than individually or in binary blends. In a blend ratio approximating that emitted by G. molesta females, these 3 components elicited increases in both early (long-range) and late (close-range) behaviors in the male response sequence. Hence, these components act as a unit. An added fourth component, dodecanol (12:OH), had significant, but subtle, effects upon the hairpencil display when Z8-12:OH was at suboptimal levels, in contrast to the stronger behavioral effects previously ascribed to 12:OH. Z8-12:OH appears important to the reproductive isolation between G. molesta and G. prunivora (Walsh), because this component strongly reduced trap capture of G. prunivora males when present at a dispenser dosage of only 1% of the acetates, and virtually eliminated capture at 10%. There was a strong correlation between pheromone plume behaviors of pre-flight wing fanning while walking and upwind flight, suggesting that these behaviors may be closely associated, functioning to locate the pheromone source by ground or air, respectively.
All Science Journal Classification (ASJC) codes
- Ecology, Evolution, Behavior and Systematics
- Insect Science