Wisconsin

Herbicide resistant weeds in Wisconsin

Updated November, 2016. Source: David Stoltenberg, University of Wisconsin; www.weedscience.org – Wisconsin

Reading this list: Each weed with herbicide resistant populations in this state is listed. Underneath each species is a list of the unique resistant biotypes of that weed in the state, according to the herbicide group(s) they are resistant to.

Lambsquarters

  • Group 5

Smooth pigweed

  • Group 5

Kochia

  • Group 2
  • Group 5

Velvetleaf

  • Group 5

Giant foxtail

  • Group 1
  • Group 2

Large crabgrass

  • Group 1

Eastern black nightshade

  • Group 2

Green foxtail

  • Group 2

Waterhemp

  • Group 2
  • Group 9
  • Group 9 + 14 (multiple resistance)

Giant ragweed

  • Group 2
  • Group 9

Horseweed

  • Group 9

Palmer amaranth

  • Group 9
  • Group 2 + 27 (multiple resistance)

Common ragweed

  • Group 2