Effect of codlemone isomers on codling moth (Lepidoptera : Tortricidae) male attraction

• We studied the effect of codlemone geometric isomers (E,Z)-, (Z,E)-, and (Z,Z)-8,10-dodecadienol on sex attraction of male codling moth, Cydia pomonella (L.), in the field and in a wind tunnel. The use of an ultrasound evaporator made it possible to apply known rates of compound at defined isomeric purity. In the wind tunnel, 5, 20, and 100% addition of Z,E isomer to (E,E) -8,10-dodecadienol (codlemone) slightly increased male night response. However, field captures with these blends were not significantly different from codlemone alone. A 20 and 100% addition of E,Z isomer decreased male landings on the odor source in the wind tunnel and trap captures in the field; Z,Z had an antagonistic effect at 100%. The equilibrium isomer blend (100% EB; 26% E,Z; 20% Z,E; 5% Z,Z) strongly reduced male attraction. The behavioral effect of isomerization of codlemone in dispenser materials used for mating disruption has to be taken into consideration.

Nyckelord

cydia pomonella

tortricidae

lepidoptera

sex pheromone

attraction inhibitor

flight tunnel

nigricana f lepidoptera

female sex-pheromone

mating disruption

cydia-pomonella

calling females

wind-tunnel

communication

flight

blend

dispensers

Ecological chemistry

Ekologisk kemi

Publikations- och innehållstyp

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