Nebraska

Nebraska Weed Management Contacts:

University of Nebraska Weed Science

University of Nebraska Weed Science Team

John Lindquist, Professor of Plant Ecology, area-wide program collaborator

Research on IWM in Nebraska:

  • ecological weed management in organic production systems
  • Weed competition with crops
  • Effects of cover crop diversity on weed populations in organic corn-soybean-wheat rotations
  • Integrating cover crops into conventional cropping systems for weed suppression
  • Understanding when weeds drop their seeds in relation to harvest
  • Effects of velvetleaf on crop production in water-stressed conditions
  • Impacts of climate change on the competitiveness of weeds
  • Critical period of weed control
  • Weed flaming
  • Impact of cropping systems on herbicide resistance evolution and management

Herbicide Resistant Weeds in Nebraska

Updated October 20, 2016. Source: John Lindquist, University of Nebraska; www.weedscience.org – Nebraska

Multiple-herbicide resistant weeds have been confirmed in Nebraska, including populations of Palmer amaranth that are resistant to both HPPD-inhibitor herbicides (Callisto, Laudis, etc) and triazines. Resistance to HPPD-inhibitors eliminates a key residual herbicide that is otherwise frequently recommended for Palmer amaranth control. Applicators and landowners in the area must be aware of the existence of these resistances in the state and avoid over-reliance on these modes of action, to help avoid the spread of these resistant populations. Please read: Multiple Herbicide Resistant Weeds and Challenges Ahead – Univ. of Nebraska CropWatch

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 in eastern & south-central

  • Group 4
  • Group 5
  • Group 9
  • Group 27
  • Group 2

Palmer amaranth – Highest concern in eastern & south-central

  • Group 2
  • Group 5
  • Group 27
  • Group 5 + Group 27 (triazines, HPPD-inhibitors)
  • Group 5 + Group 9 (triazines, glyphosate)

Kochia – Highest concern in western NE

  • Group 4
  • Group 5
  • Group 9
  • Group 2
  • Group 2 + Group 9

Giant ragweed – Highest concern in northern & northeastern

  • Group 9

Common ragweed – Highest concern in northern & northeastern

  • Group 9

Horseweed/marestail

  • Group 9
  • Group 2

Johnsongrass

  • Group 2

Redroot pigweed

  • Group 5

Shattercane

  • Group 2