At this time, there is only one ongoing investigation in Minnesota for Palmer amaranth. That case is in Houston County, in extreme southeastern Minnesota. Minnesota Department of Agriculture Seed Section Manager Denise Thiede addressed this weed issue during the Minnesota Crop Improvement Association virtual annual meeting. “The seed industry adopting the genetic testing that we’re requiring is one key component of our success in this state.” Three sites in Winona County were investigated this past year for Palmer amaranth. The suspected source for the Winona County cases is the manure from a dairy farm where cottonseed was fed.
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