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Egg loads and egg masses: Parasitism ofChoristoneura rosaceana eggs by Trichogramma minutum after inundativerelease in a commercial blueberry field

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Abstract

Inundative releases of Trichogramma minutum Riley were made in a commercialblueberry field in British Columbia, Canada, todetermine the extent of dispersal of adult wasps, andto determine whether complete parasitism of eggswithin egg masses of the target host [oblique-bandedleafroller (OBLR), Choristoneura rosaceana(Harris)] occurred. Three weekly releases of waspswere made from a single release point in the center ofeach field during the flight of first generation OBLRadults. Sticky trap, sentinel egg mass andtarget-host egg mass data all indicated only a limitedrange of dispersal of T. minutum within thefield. In addition, only partial parasitism of eggmasses of the target host occurred even in closeproximity to the release point. We discuss theimportance of determining the response of Trichogramma females to previously-parasitized eggswhen using Trichogramma wasps for biologicalcontrol of lepidopterous species that oviposit largeegg masses.

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Authors and Affiliations

  1. E.S. Cropconsult Ltd., Vancouver, Britih Columbia, Canada

    R. McGregor, Gillian Caddick & Deborah Henderson

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  1. R. McGregor
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  2. Gillian Caddick
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  3. Deborah Henderson
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Correspondence to R. McGregor.

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McGregor, R., Caddick, G. & Henderson, D. Egg loads and egg masses: Parasitism ofChoristoneura rosaceana eggs by Trichogramma minutum after inundativerelease in a commercial blueberry field. BioControl 45, 257–268 (2000). https://doi.org/10.1023/A:1009922101934

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  • DOI: https://doi.org/10.1023/A:1009922101934

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