Arkansas

Herbicide Resistant Weeds in Arkansas

Updated October 24, 2016. Lauren Schwartz, University of Arkansas; www.weedscience.org – Arkansas

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.

Goosegrass

  • Group 3

Common cocklebur

  • Group 2
  • Group 17

Barnyardgrass

  • Group 7
  • Group 7 + Group 4
  • Group 13

Palmer amaranth

  • Group 9
  • Group 2
  • Group 14

Redroot pigweed

  • Group 2

Tall waterhemp

  • Group 9

Italian ryegrass

  • Group 1
  • Group 2
  • Group 1 + Group 2
  • Group 9

Red rice

  • Group 2

Horseweed/marestail

  • Group 9

Common ragweed

  • Group 9

Giant ragweed

  • Group 9

Johnsongrass

  • Group 9

Rice flatsedge

  • Group 2

Smallflower umbrella sedge

  • Group 2

Junglerice

  • Group 2 + Group 7 + Group 26

Yellow nutsedge

  • Group 2

Resources:

VIDEO: Weed Control in Cotton: Strategies to Fight Resistance – Jason Norsworthy