Journal Article

Differences in the Relationship Between Sensory Adaptation of Antennae and Concentration of Aerial Pheromone in the Oriental Fruit Moth and Obliquebanded Leafroller (Lepidoptera: Tortricidae): Implications for the Role of Adaptation in Sex Pheromone–Mediated Mating Disruption of These Species

R. M. Trimble and D. B. Marshall

in Environmental Entomology

Published on behalf of Entomological Society of America

Volume 39, issue 2, pages 625-632
Published in print April 2010 | ISSN: 0046-225X
Published online November 2014 | e-ISSN: 1938-2936 | DOI: http://dx.doi.org/10.1603/EN09178

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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.

Keywords: Grapholita molesta; Choristoneura rosaceana; pheromone; antenna; sensory adaptation

Journal Article.  6508 words.  Illustrated.

Subjects: Entomology

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