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In a previous study we have reported that both (E,Z )-8,10-dodecadienol (E,Z ) and (Z,Z )- 8,10-dodecadienol (Z,Z ) isomers inhibit the attraction of male codling moth, Cydia pomonella L. when added to (E,E)-8,10-dodecadienol (E,E ) while the (E,E)-8,10-dodecadienol (Z,E ) isomer induces slight increase in the number of males attracted to the pheromone source. In the p resent study, we have tested the behavioral activity of the individual geometrical isomers E,Z; Z,E and Z,Z . A few number of codling moth males flew to the Z,E -isomer while the other two isomers (i.e. E,Z and Z,Z ) did not elicit any upwind orientation. Analysis of the flight behavior to the E,E- and Z,E-isomer showed significant differences in most of the flight parameters evaluated. Based on the biological observations and molecular modeling, we suggest that the behavioral activity of the Z,E-isomer is due to presence of specific receptors for this isomer on male antennae and not to its structural resemblance to the E,E-isomer. These results underline the importance of the Z,E-isomer in sex attraction of male codling moth.

zeitschrift für naturforschung c

Flight and Molecular Modeling Study on the Response of Codling Moth, Cydia pomonella (Lepidoptera: Tortricidae) to (E,E)-8,10-Dodecadien-1-ol and Its Geometrical Isomers