Missouri

Missouri Weed Science Contacts:

Kevin Bradley, Professor in Plant Sciences, area-wide project collaborator

University of Missouri Weed Science Personnel

Weed Management Resources for Missouri:

The 6 R’s of Herbicide-Resistant Weed Management

University of Missouri Weed Science

Weed ID Guide

Mizzou Weed Science YouTube Videos

Mizzou Weed Science slideshow presentations

Mizzou Weed Science newsletter archives

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

Research on IWM in Missouri:

  • Strategies for the management of glyphosate- and multiple herbicide-resistant weed biotypes
  • Development of programs for the prevention and management of herbicide-resistant weeds
  • Interaction of herbicides and weeds with other agrochemicals and pests in the agroecosystem
  • Mechanisms of spread of pigweed seeds – Duck Dynasty May Have Triggered a Weed Dynasty
  • Evaluating the effectiveness of future herbicide-tolerant crop technologies for the management of troublesome species like waterhemp
  • Effects of common pasture weeds on forage yield, quality, and grazing preference

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