Horseweed the focus of new Extension publication
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. …