Glyphosate-Resistant Palmer Amaranth Field Day July 10

Glyphosate-resistant Palmer amaranth in corn
Figure 1. Figure 1. Glyphosate-resistant Palmer amaranth infesting a corn field in south central Nebraska. (Archive photo by Amit Jhala)

Glyphosate-Resistant Palmer Amaranth Field Day July 10

Jason Norsworthy, a weed scientist from the University of Arkansas, will be the keynote speaker at this year's Glyphosate-Resistant Palmer Amaranth Management Field Day. The free event will be Wednesday, July 10, at Carleton.

Jason Norsworthy
Jason Norsworthy

Norsworthy is a professor and the endowed chair of the Weed Science Department at the University of Arkansas. He has documented eight herbicide-resistant weeds in Arkansas, including glyphosate-resistant Palmer amaranth, and speaks nationally and internationally on his findings.

The field day will start with registration and rolls at 8:30 a.m. and end after lunch at 1 p.m. Field tours will be held from 9:30 to 11:15 a.m. when Norsworthy will speak. See program flyer for full agenda.

Field Demonstrations

Palmer amaranth, a member of the pigweed (Amaranthaceae) family, is one of the most troublesome weeds in soybean. Glyphosate-resistant Palmer amaranth was first found in south central Nebraska in the summer of 2016 and since then has spread to other areas in the state. The tour is of field demonstrations on how to control resistant Palmer amaranth in field and seed corn production.

Tour demonstrations include:

  • How row spacing and herbicide programs can affect glyphosate-resistant Palmer amaranth control in Roundup Ready 2 Xtend Soybean
  • Management of Palmer amaranth in
    • Alite 27 Soybean (resistant to isoxaflutole/glyphosate/glufosinate)
    • Enlist E3 Soybean (resistant to 2,4-D choline/glyphosate/glufosinate)
  • How the critical period of Palmer amaranth removal is affected by residual herbicides in
    Roundup Ready 2 Xtend Soybean

There is no cost to attend the field day, but participants are asked to register at Three Certified Crop Advisor (CCA) continuing education credits will be available.

For more information on the field day or managing glyphosate-resistant Palmer amaranth, contact Amit Jhala, Nebraska Extension weed management specialist, at 402-472-1534 or

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