2020
Innovative strategies to manage glyphosate-resistant horseweed (marestail) in soybean
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Contributor/Checkoff:
Michigan Soybean Committee
Category:
Sustainable Production
Keywords:
AgricultureCrop protectionHerbicide
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Christy Sprague, Michigan State University
Co-Principal Investigators:
Project Code:
2008
Contributing Organization (Checkoff):
Michigan Soybean Committee
$26,000
Institution Funded:
Michigan State University
$26,000
Brief Project Summary:

Horseweed (marestail) continues to be the #1 weed escape in Michigan soybean fields. Resistance to ALS-inhibitors (Group 2) and/or glyphosate (Group 9) leaves few options for post-emergence horseweed control. In addition to multiple herbicide resistance, prolonged emergence, changes in tillage practices and capabilities of long distance seed dispersal have also contributed to the increased prevalence of horseweed in many of Michigan’s soybean fields.

During the past two seasons, with funding by MSPC and Project GREEEN, we have conducted research that has shown fall-seeded cereal cover crops provide early-season horseweed suppression compared with no cover. Additionally, delaying cover...

Unique Keywords:
#weed control
Information And Results
Project Deliverables

Information from this research will be used to further develop and demonstrate recommendations for control of glyphosate-resistant horseweed to Michigan soybean growers. These recommendations will be used to further refine and update the “Herbicide-resistant (marestail) in Michigan: Keys to management in no-till soybean” factsheet that is posted on the MSUWeeds.com website and in the MSU Weed Control Guide for Field Crops (E0434) and on the web at www.msuweeds.com. This bulletin is sold to over 1300 farmers, dealers, and weed management influencers. In addition, we will continue to hold meetings throughout the state to make growers aware of the issues and the options for control of herbicide-resistant horseweed. The awareness from our outreach efforts will continue to be important to identify and manage this troublesome weed.

Final Project Results

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.