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Edge Effects in the Directionally Biased Distribution of Choristoneura rosaceana (Lepidoptera: Tortricidae) in Apple Orchards

Hsu, C. L. ; Agnello, A. M. ; Reissig, W. H.

In: Environmental Entomology, 2009, vol. 38, no. 2, p. 433-441

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    Title
    • Edge Effects in the Directionally Biased Distribution of Choristoneura rosaceana (Lepidoptera: Tortricidae) in Apple Orchards
    Author
    • Hsu, C. L.. Cornell University, New York State Agricultural Experiment Station, 630 W. North St., Geneva, NY 14456
    • Agnello, A. M.. Cornell University, New York State Agricultural Experiment Station, 630 W. North St., Geneva, NY 14456
    • Reissig, W. H.. Cornell University, New York State Agricultural Experiment Station, 630 W. North St., Geneva, NY 14456
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Environmental Entomology, 2009, vol. 38, no. 2, p. 433-441. Oxford University Press
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:302270
    Summary
    Edge effect tests have been used in a number of studies on obliquebanded leafroller, Choristoneura rosaceana (Harris), to test for evidence of mated female immigration into pheromone-treated orchards. This type of test compares obliquebanded leafroller presence or activity around the perimeter of an orchard against presence or activity in the interior. Higher numbers detected around the edges of an orchard would indicate higher levels of flight activity at the edge, a pattern that could be generated by high levels of immigration. Recent work has shown that the spatial distribution of recaptured obliquebanded leafroller adults released from a single location can be directionally biased, which could obscure the ability to detect an edge effect. To test this theory, data from an orchard study conducted in 1991 that found no significant edge effect was reanalyzed. When we accounted for the directional bias in the distribution of first-generation mated female moths, we found an edge effect with significantly more mated females captured in the edge traps than in the center or mid-interior traps. No edge effect was found when the directional bias was ignored. In addition, second-generation males and mated females both showed a significant edge effect that had not been detected in the original analysis, which had combined both first- and second-generation data