2025
Documenting the extent of resistance to Group 15 herbicides in Illinois waterhemp populations
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Contributor/Checkoff:
Illinois Soybean Association
Category:
Sustainable Production
Keywords:
Crop protectionHerbicideResistance
Parent Project:
Documenting the extent of resistance to Group 15 herbicides in Illinois waterhemp populations
Lead Principal Investigator:
Aaron Hager, University of Illinois at Urbana-Champaign
Co-Principal Investigators:
Patrick Tranel, University of Illinois at Urbana-Champaign
Project Code:
Contributing Organization (Checkoff):
Illinois Soybean Association
$57,117
Institution Funded:
University of Illinois at Urbana-Champaign
$57,117
Brief Project Summary:
This is the second year of proposed research that will allow us to determine the extent of resistance to Group 15 herbicides in Illinois waterhemp populations. The results will provide the data needed to make appropriate herbicide recommendations to Illinois soybean producers. Populations confirmed resistant to Group 15 herbicides will be used in subsequent research to identify the gene(s) conferring the metabolism-based resistance, which could lead to rapid molecular assays for future resistance testing.
Information And Results
Project Summary

This is the second year of proposed research that will allow us to determine the extent of resistance to Group 15 herbicides in Illinois waterhemp populations. The results will provide the data needed to make appropriate herbicide recommendations to Illinois soybean producers. Populations confirmed resistant to Group 15 herbicides will be used in subsequent research to identify the gene(s) conferring the metabolism-based resistance, which could lead to rapid molecular assays for future resistance testing.

Project Objectives

We have collected more than 120 waterhemp accessions from Illinois fields and have begun to screen these for resistance using a greenhouse assay previously developed by Strom et al. (2019). Identified resistant populations will be further evaluated to quantify resistance levels.

Project Deliverables

The outcomes will allow us to understand the extent of resistance to Group 15 herbicides and how these herbicides should be recommended for use in soybean production. This research also will provide the populations needed for subsequent research that will identify the gene(s) conferring the metabolism-based resistance.

Progress Of Work

Final Project Results

Benefit To Soybean Farmers

The results will provide the data needed to make appropriate herbicide recommendations to Illinois soybean producers.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.