The antennae of Grapholita molesta (Busck) are more susceptible to sex pheromone—induced sensory adaptation than the antennae of Choristoneura rosaceana (Harris). Adaptation is detectable in G. molesta at 1/1,000th the aerial concentration of pheromone (i.e., 5.0 × 10-7 ng Z8-12:OAc/ml air) that is required to induce detectable adaptation in C. rosaceana (i.e., 5.0 × 10-4 ng Z11–14:OAc/ml air). In addition, the predicted concentration of pheromone required to induce 50% adaptation in G. molesta (i.e., 1.2 × 10-3 ng Z8–12:OAc/ml air) after 15 min of exposure is only one sixth the estimated aerial concentration required to induce the same level of adaptation in C. rosaceana (i.e., 7.5 × 10-3 ng Z11–14:OAc/ml air) after 15 min of exposure. Sixteen percent and 28% adaptation of G. molesta antennae is predicted after 15 and 30 min of exposure to the equivalent of 1 ng Z8–12:OAc/m3 air (i.e., 1 × 10-6 ng Z8–12:OAc/ml air). The predicted level of adaptation in C. rosaceana antennae, however, is only 1.5 and 9.9% after 15 and 30 min of exposure, respectively, to the equivalent of 1 ng Z11–14:OAc/m3 air (i.e., 1 × 10-6 ng Z11–14:OAc/ml air). The approximately three-fold greater level of sensory adaptation in G. molesta antennae after 30 min of exposure to a pheromone concentration measured in pheromone-treated orchards (i.e., 1 ng/m3) may be one reason why this species is more readily controlled than C. rosaceana using mating disruption.
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