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In British Columbia, several pheromone blends were tested as possible mating disruptants for 2 sympatric, orchard-inhabiting leafrollers (Lepidoptera: Tortricidae), the obliquebanded leafroller, Choristoneura rosaceana (Harris), and the threelined leafroller, Pandemis limitata (Robinson). Z9-tetradecenyl acetate (Z9-14:OAc), a minor pheromone component of the P. limitata pheromone and known pheromone antagonist of C. rosaceana, was tested alone and in combination with Z11-tetradecenyl acetate (Z11-14:OAc), the major pheromone component of both species, and additional minor components of the C. rosaceana pheromone, as mating disruptants of both species. Disruption of mating, assessed using tethered virgin females of both species, was tested in 0.1-ha plots (33.3 by 33.3 m), using fiber-tape dispensers releasing ≈10 mg/ha per hour. Z9-14:OAc applied alone did not significantly disrupt mating of either species. All treatments containing Z11-14:OAc and Z9-14:OAc in a ≈1:1 ratio equally reduced mating of both species. Furthermore, an ≈91:6 ratio of Z11-14:Oac : Z9-14:OAc, which is highly attractive to P. limitata, was no more effective than a less attractive pheromone blend containing a, ≈1:1 ratio of these components. Unattractive blends combining the major component, Z11-14:OAc and the inhibitor, Z9-14:OAc, disrupted mating of C. rosaceana as effectively as the major component alone. These results indicate that false-trail following was not an important mechanism of mating disruption for either of these species in this experimental setting. We conclude that Z11-14:OAc could be used alone or in combination with Z9-14:OAc to disrupt mating in both leafrollers simultaneously.
Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.