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Male Oriental fruit moths, Grapholita molesta (Busck), were brießy preexposed in a wind tunnel to plumes from a rubber septum lure releasing a three-component, optimally attractive pheromone blend for this species or to plumes generated by Isomate-M Rosso pheromone dispensers. The objectives were to determine how brief preexposures to low- and high-dosage pheromone dispensers affect initiation of anemotaxis, duration of sustained anemotactic ßight, and peripheral sensitivity 15 min and 24 h after exposure. A greater proportion of G. molesta males took ßight and successfully oriented toward a lure 15 min after brießy orienting in plumes generated by an identical lure compared with unexposed, naõ¨ve moths or control moths preexposed to clean air. In addition, the proportion of males contacting a lure or orienting to the lure without source contact 24 h after a preexposure was not signiÞcantly different from the proportions of naõ¨ve or control moths completing these behaviors. However, the mean duration of sustained ßights of lure-preexposed male G. molesta in plumes generated by a lure was signiÞcantly shorter 15 min and 24 h after preexposure compared with that of naõ¨ve moths. The proportion of male G. molesta contacting lures 15 min and 24 h after preexposure to ropes was not statistically different from the proportions of naõ¨ve or control moths contacting the lure or orienting without source contact. However, as observed with moths preexposed to a lure, the mean duration of sustained ßights of male G. molesta preexposed to an Isomate-M Rosso dispenser was signiÞcantly shorter than that of naõ¨ve moths 15 min and 24 h after preexposure. Mean durations of sustained ßights of male G. molesta preexposed to a lure or rope were signiÞcantly longer after 24 h compared with 15 min after the exposure treatment, indicating that the effect of pheromone preexposure decayed over time. Electroantennograms recorded 15 min and 24 h after preexposures to lures or Isomate-M Rosso dispensers in the ßight tunnel were indistinguishable from those recorded from unexposed moths. We suggest that false-plume following by naõ¨ve maleG.molesta combined with decreases in duration of subsequent anemotactic orientations after previous bouts of false-plume following may explain why Isomate-M Rosso dispensers are effective in mating disruption experiments with G. molesta.

environmental entomology

Seconds-Long Preexposures to Pheromone from Rubber Septum or Polyethelene Tube Dispensers Alters Subsequent Behavioral Responses of Male<i>Grapholita molesta</i>(Lepidoptera: Tortricidae) in a Sustained-Flight Tunnel

Seconds-Long Preexposures to Pheromone from Rubber Septum or Polyethelene Tube Dispensers Alters Subsequent Behavioral Responses of MaleGrapholita molesta(Lepidoptera: Tortricidae) in a Sustained-Flight Tunnel