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1 July 2005 Occurrence and Duration of Long-Lasting Peripheral Adaptation Among Males of Three Species of Economically Important Tortricid Moths
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Electroantennograms (EAGs) of Cydia pomonella (L.), Pandemis pyrusana Kearfott, and Grapholita molesta (Busck) documented the presence and duration of long-lasting peripheral adaptation after pheromone preexposure. Moths of each species were preexposed for 1 h to varying dosages (100 ng–100 mg) of the major components of their respective pheromone blends in 1-liter Teflon containers with constant throughput of air. EAGs were performed on all insects 1 min after preexposure and at several subsequent intervals up to 120 min after exposure. Long-lasting peripheral adaptation was recorded by EAG after pheromone preexposure over a range of pheromone dosages in both C. pomonella (100 μg–10 mg) and P. pyrusana (100 ng–100 mg). This reduction in EAG responsiveness lasted ≈60 and 10 min, respectively, for these two species. For G. molesta, a reduction in EAG responsiveness occurred only after 1 h of exposure to the highest dosage of pheromone tested (100 mg). Recovery from adaptation was also rapid in this species: EAGs were significantly reduced to all applied stimulus dosages only at 1-min postexposure. There was substantial variation in the prevalence and duration of decreased EAG responsiveness across the species investigated. However, where long-lasting adaptation was described, the phenomenon lasted ≤60 min. In addition, long-lasting adaptation was induced after prolonged exposures at estimated airborne concentrations of pheromone in the range of nanograms per milliliter, which are much higher than the pheromone concentrations in field plots treated with synthetic pheromone dispensers. Long-lasting peripheral adaptation after pheromone preexposure does not seem to be an important contributor to mating disruption.

L. L. Stelinski, L. J. Gut, and J. R. Miller "Occurrence and Duration of Long-Lasting Peripheral Adaptation Among Males of Three Species of Economically Important Tortricid Moths," Annals of the Entomological Society of America 98(4), 580-586, (1 July 2005).[0580:OADOLP]2.0.CO;2
Received: 1 February 2005; Accepted: 1 April 2005; Published: 1 July 2005

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