Responses of Four Torticid Moth Species (Lepidoptera: Tortricidae) to High-Release Pheromone Dispensers: Implications for Mating Disruption of These Species
Pierzchala, Anna V.
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The behaviors of four tortricid moth species to high-release pheromone rope dispensers were observed in a Michigan orchard. The species investigated include the obliquebanded leafroller (Choristoneura rosaceana), redbanded leafroller (Argyrotaenia velutinana), oriental fruit moth (Grapholita molesta), and codling moth (Cydia pomonella). All species, with the exception of codling moth, were observed to approach their respective pheromone dispensers. Oblique banded leafroller and redbanded leafroller were both assayed in a sustained-flight wind tunnel to determine changes in response to multiple component pheromone lures and rope dispensers 24h after preexposure to ropes to quantify the physiological effect of mating disruption conditions. Significantly more pre-exposed RBLR males oriented to ropes than unexposed males. Conversely, significantly fewer pre-exposed OBLR males oriented to ropes than unexposed males. Significantly more pre-exposed OBLR oriented to lures than naive males. Collectively, results suggest that OBLR experience a decrease in response threshold after pre-exposure to ropes whereas RBLR experience an increase in response threshold.
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