Farm Progress is part of the Informa Markets Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Scout Corn Fields for These 5 Weeds

With more weeds becoming glyphosate-resistant or surviving glyphosate-only applications, corn growers continue to rely on residual herbicides to manage tough weeds and protect their yield. "We need to maximize the number of sites of action,” says Travis Legleiter, weed program science specialist at Purdue University. “We don’t have a lot of sites of action left to us, so we need to maximize what we do have available and rotate them as much as we can. Avoid applying any site of action more than two times in a growing season. By applying a site of action more than two times in a growing season, we’re putting pressure on those weeds to become resistant to it.”

Like what you're reading? Subscribe to CSD Extra and get the latest news right to your inbox!

This corn and soybean herbicide chart describes mode of action in greater detail, by herbicide class. By eliminating weed pressure early, growers can protect corn during critical stages of development as well as optimizing yield potential. Watch for these five high-anxiety weeds that could threaten your corn yields this season.

For the latest herbicide-resistant weed information, visit To learn more about SureStart, visit or contact your local ag retailer.

You might also like:

Cold Weather Affects Planted Soybeans

Plant Corn Based on Field Conditions, Not Calendar Date

Final Call for Census of Agriculture

1MSU Weed Science website. Available at:

2PLANTS Profile. United States Department of Agriculture Natural Resources Conservation Service website. Available at:

3Data collected from university field trials spanning 19 states from 2010-2011.

4Stratus Agri-Marketing Inc. Glyphosate Resistance Tracking USA 2012.

5Shoup, D., Peterson, D. Understanding and Managing Marestail. Available at:

6Sprague, C. Palmer Amaranth in Michigan. Available at:

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.