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Trap Response and Fruit Damage by Obliquebanded Leafroller (Lepidoptera: Tortricidae) in Pheromone-Treated Apple Orchards in New York

Agnello, Arthur M. ; Reissig, W. Harvey ; Spangler, Steve M. ; Charlton, Ralph E. ; Kain, David P.

In: Environmental Entomology, 1996, vol. 25, no. 2, p. 268-282

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    Titre
    • Trap Response and Fruit Damage by Obliquebanded Leafroller (Lepidoptera: Tortricidae) in Pheromone-Treated Apple Orchards in New York
    Auteur
    • Agnello, Arthur M.. Department of Entomology, Cornell University, New York State Agricultural Experiment Station, Geneva, NY 14456
    • Reissig, W. Harvey. Department of Entomology, Cornell University, New York State Agricultural Experiment Station, Geneva, NY 14456
    • Spangler, Steve M.. Department of Entomology, Cornell University, New York State Agricultural Experiment Station, Geneva, NY 14456
    • Charlton, Ralph E.. Department of Entomology, Cornell University, New York State Agricultural Experiment Station, Geneva, NY 14456
    • Kain, David P.. Department of Entomology, Cornell University, New York State Agricultural Experiment Station, Geneva, NY 14456
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Environmental Entomology, 1996, vol. 25, no. 2, p. 268-282. Oxford University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:295508
    Summary
    Pheromone disruptants were tested from 1989 to 1992 in western New York to determine effect on trap catch and potential use in the control of obliquebanded leafroller. Choristoneura rosaceana (Harris), using polyethylene tube tie and controlled-release membrane dispensers in plots of 0.2-2.4 ha. Effectiveness of pheromone at different application rates and canopy locations was evaluated using synthetic pheromone-baited traps, molassesbaited traps, and by inspecting foliar terminals and fruit for leafroller damage. All pheromone treatments significantly reduced (by 56-97%) pheromone trap catches of male moths compared with catches in nontreated blocks. One application of a natural-blend formulation at 988 dispensers per hectare was better than 494/ha at disrupting trap catch of both Rights that occur during the year. However, mated female moths were present in the orchard center as frequently as anywhere else in a pheromone-treated block, indicating either immigration from outside sources or resident females that were not prevented from mating by the pheromone. The membrane dispenser emitted the 3-component natural blend at proportions similar to those in wild female moths. Pheromone traps placed in the tops of trees in a pheromone-treated orchard always caught higher numbers of male moths than those in lower- or middle-canopy positions. Pheromone treatment resulted in fruit damage similar to that of a pheromone + insecticide treatment under low to moderate leafroller population pressure (i.e., 3-5% fruit damage in untreated orchards); however, no control method was able to reduce damage to acceptable levels in all cases