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Q&A ViewAttendees 2

Plant-Insect Ecosystems

10-Minute Paper

P-IE: IPM - Horticultural Crops

Volatilized fatty acids to determine natal hosts of filbertworm

Wednesday, November 3, 2021
3:30 PM – 3:42 PM MT
Location: Colorado Convention Center, Meeting Room 107-109
In-Person

    Presenting Author(s)

  • Heather E. Andrews

    Faculty Research Assistant
    North Willamette Research and Extension Center- Oregon State University
    Aurora, Oregon

    • Co-Author(s)

  • Man-yeon Choi

    Research Entomologist
    USDA-ARS
    Corvallis, Oregon

  • NW

    Nik G. Wiman

    Oregon State University
    Corvallis, Oregon

The hosts of filbertworm Cydia latiferreana Walsingham (Lepidoptera: Tortricidae) were oaks and California hazelnut (Corlyus cornuta ssp. Californica (A. DC.)) until the introduction of the European hazelnut (Corylus avellana L.) to the Pacific Northwest as a crop in the mid 1800’s.  Since then, this native moth has been the primary pest of European hazelnuts grown in the Pacific Northwest.  Alternate hosts provide refugia that C. latiferreana can use for development, and may interact with populations that infest farms, confounding management.  Understanding alternate host dynamics and movement of key pests such as C. latiferreana between hosts is critical to optimize pest control. For insects that primarily acquire lipids in the larval stage, volatilized fatty acid profiles of the adult stage offer a methodology for determining the natal host and movement patterns. The technique has several advantages over other marking methods. Studies performed on Navel orangeworm Amyelois transitella (Walker) (Lepidoptera: Pyralidae) in California pioneered this method to evaluate movement of moths between different nut crops.  Initially we conducted lipid analyses on C. latiferreana that were raised on various diets in the lab, and found that we can discriminate the host based on fatty acid profiles with a high level of confidence.  The following year we analyzed lipids in field captured C. latiferreana.  These results and next steps to answer critical questions for pest management will be discussed.