Horseweed the focus of new Extension publication

Written by: Erin Hill

Primary Source: MSU Weeds.com Blog

Horseweed/marestail has been the #1 weed submitted to MSU Diagnostic Services for herbicide-resistance screening. In 2015, all samples screened were found to be resistant to glyphosate. In 2016, screens have only been completed for 6 of the 36 samples submitted, but all thus far were resistant to both glyphosate and the ALS inhibiting herbicides (e.g. FirstRate, Group 2). With wind dispersal making this problematic weed more and more widespread with each passing year it is important to be diligent about control. Just this past month Christy Sprague has published a new MSU Weed Science bulletin addressing this issue titled, “Herbicide-resistant horseweed (marestail) in Michigan: Keys to management in no-till soybean.” Check out the bulletin to see her latest recommendations.

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Erin Hill
I am interested in weed ecology as it pertains to agricultural production. I am also interested in field crop and vegetable production systems, the use of cover crops and other sustainable practices, herbicide resistance, and environmental preservation.