Texas Weed Management Resources and Contacts:

Texas A&M University Weed Science

Muthu Bagavathiannan, Assistant Professor of Weed Science, area-wide program collaborator

Photo: Muthu Bagavathiannan, Texas A&M University

Research on IWM in Texas

  • Evaluation of cover crops for weed suppression
  • Harvest weed seed control for johnsongrass and ryegrass
  • Non-chemical options for weed management in organic rice and grain production
  • Biology and ecology of dominant arable weeds
  • Evolutionary biology of herbicide resistance in weeds
  • Development of novel weed management tools and approaches for integration
  • Simulation modeling and decision-support tools

Herbicide Resistant Weeds in Texas

Photo: Muthu Bagavanthiannan, Texas A&M University

Updated October, 2016. Source: Muthu Bagavathiannan, Texas A&M University; www.weedscience.org – Texas

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.

Annual ryegrass

  • Group 1
  • Group 2


  • Group 2 (ALS) + Group 7 (propanil) + Group 4 (quinclorac)

Palmer amaranth

  • Group 2
  • Group 5 (atrazine)
  • Group 9 (glyphosate)


  • Group 2


  • Group 2

Tall waterhemp

  • Group 2
  • Group 9

Giant ragweed

  • Group 9

Weedy sunflower

  • Group 9

Annual bluegrass

  • Group 2
  • Group 5

Nealley’s sprangletop

  • Group 2
  • Group 9

Weedy rice/ red rice

  • Group 2 (ALS)

Weed Management in Texas Cotton – Texas A & M University