Antennal response of codling moth males, Cydia pomonella L. (Lepidoptera :Tortricidae), to the geometric isomers of codlemone and codlemone acetate

Single sensillum recordings from Cydia pomonella male antennae showed three different types of receptor neurons. The most abundant type was most sensi tive to the main pheromone compound (E,E)-8,10-dodecadienol, while its resp onse to the geometric isomers E,Z, Z,E and Z,Z was comparable to a tenfold lower dose of (E,E)-8,10-dodecadienol. This neuron type also responded to t he four behaviorally antagonistic isomers of (Delta,Delta)-8,10-dodecadieny l acetate, among which it was most sensitive to the E,E isomer. Cross-adapt ation studies showed that these compounds were all detected by the same rec eptor neuron type. Receptor neurons specifically tuned to (E,Z) or (Z,Z)-8, 10-dodecadienol were not found, although these two compounds are behavioral ly active. A second type of receptor neuron responded to all isomers of (De lta,Delta)-8,10-dodecadienyl acetate and was most sensitive to the E,E isom er. This neuron type did not respond to any of the isomers of (Delta,Delta) -8,10-dodecadienol. A third receptor neuron type was highly sensitive to th e plant compound alpha-farnesene. The finding that the receptor neuron type tuned to the main pheromone compound responded even to strong behavioral a ntagonists aids the interpretation of ongoing behavioral studies for the de velopment of the mating disruption technique in codling moth.