Missouri

University of Missouri Weed Science: http://weedscience.missouri.edu/

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In the news: Multiple-herbicide resistant Palmer amaranth identified in Missouri

Herbicide Resistant Weeds in Missouri

Updated October, 2016. Source: Kevin Bradley, University of Missouri; www.weedscience.org – Missouri

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.

Tall waterhemp – Highest concern

  • Group 2
  • Group 5
  • Group 9
  • Group 4
  • Group 27
  • Group 2 + Group 9
  • Group 2 + Group 9 + Group 14
  • Group 2 + Group 9 + Group 5
  • Group 2 + Group 9 + Group 5 + Group 27

Giant ragweed – Second highest concern

  • Group 9
  • Group 2 + Group 9

Horseweed – Third highest concern

  • Group 9

Palmer amaranth

  • Group 9
  • Group 9 + Group 14

Common cocklebur

  • Group 2

Barnyardgrass

  • Group 7

Common sunflower

  • Group 2

Common ragweed

  • Group 9

Annual bluegrass

  • Group 9

Italian ryegrass

  • Group 1 + Group 2