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Corn Rootworm IPM

Regional Working Group

News

  • 2024 Handy Bt Trait Table

    2024 Handy Bt Trait Table (U.S.)

    This 2-page document list the types of Bt present in all commercialized corn in the U.S.A. in a concise format. It presents the trade names for traits, Bt event, protein(s) expressed, targeted insects and herbicide traits.

    Now in its 22nd year, the Trait Table for field corn has become the standard as an authoritative reference to Bt toxins in corn. Dr. Chris DiFonzo at Michigan State University is the author, and questions or comments should be directed to her. 

  • 2023 Regional Corn Rootworm Monitoring Network Summary page

    2023 Regional Corn Rootworm Monitoring Network Summary

    Western corn rootworm (WCR) and northern corn rootworm (NCR) continue to dominate as
    economic pests throughout the U.S. and Canada. Recently, high corn rootworm
    populations and the development of resistance to Bt corn hybrids in some areas has sparked
    greater interest in scouting and alternative management of corn rootworms. In response,
    the Corn Rootworm IPM Regional Working Group was formed during the spring of 2021
    and continues to grow. Currently, we are made up of university, industry, and government
    personnel from at least 11 U.S. states and 5 Canadian provinces.

  • 2023 Ontario Summary

    2023 Ontario Corn Rootworm Trap Network Report

    Results from the 2023 Ontario corn rootworm (CRW) trap sites monitored through the Adult Corn Rootworm (CRW) Trap Monitoring Network have been summarized in the infographic below. Thank you to all the trap participants for monitoring their traps this year. These sites are helping us to identify fields and counties with potential resistant corn rootworm populations and understand the rootworm risk for 2024 in continuous corn fields. A big thanks to Dan Bihari, Senior GIS Specialist, OMAFRA for developing and maintaining the trap network site and to our sponsors including Grain Farmers of Ontario (GFO), Agricultural Biotechnology Stewardship Technical Committee (ABSTC) and OMAFRA for funding trap supplies.

  • injured corn roots; photo by Erin Hodgson (ISU)

    It's time to check whether corn rootworm management worked

    Corn rootworm egg hatch in Iowa typically occurs from late May to the middle of June, with an average peak hatching date of June 6 in central Iowa. Development is driven by soil temperature and measured by growing degree days (GDDs). Research suggests about 50% of egg hatch occurs between 684-767 accumulated GDDs (since January 1; base 52°F, soil). Most areas within Iowa have reached peak egg hatch for corn rootworm, and we have heard several reports of folks finding larvae by digging roots in cornfields.

  • Canadian Bt trait tables 2023

    2023 Bt Trait Tables for Canada

    The Canadian Bt Corn Trait Tables have been updated for March 2023. These tables include all registered Bt Corn Trait Packages and indicates which Bt proteins and herbicide tolerant traits they contain and pests they target. These tables also include known resistance status for each pest and Bt protein. This article contains links to English and French versions of the tables.

  • Handy Bt trait table March 2023

    2023 Handy Bt Trait Table (U.S.)

    This 2-page document list the types of Bt present in all commercialized corn in the U.S.A. in a concise format. It presents the trade names for traits, Bt event, protein(s) expressed, targeted insects, and herbicide traits. Now in its 21st year, the Trait Table for field corn has become the standard as an authoritative reference to Bt toxins in corn. Be sure to check out the new supplemental documents for the trait table, including a checklist of Bt events by stack, table of Bt events, and EPA registration numbers.

  • Ontario CRW trapping network highlights 2022

    2022 Ontario corn rootworm trapping network results

    Tracey Baute from Ontario publishes an infographic with key takeaways from the corn rootworm monitoring network in 2022.

  • 2022 Regional Corn Rootworm Monitoring Network Summary

    2022 Regional Corn Rootworm Monitoring Network Report

    Western corn rootworm (WCR) and northern corn rootworm (NCR) continue to dominate as economic pests throughout the U.S. and Canada. Recently, high corn rootworm populations and the development of resistance to Bt corn hybrids in some areas has sparked greater interest in scouting and alternative management of corn rootworms. In response, the Corn Rootworm IPM Regional Working Group was formed during the spring of 2021 and continues to grow. Currently, we are made up of university, industry, and government personnel from at least 12 U.S. states and 5 Canadian provinces.

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