Blog Post

Conquer the War Against Corn and Soybean Weeds

This agronomic image shows giant ragweed.

Giant ragweed is one of the earliest emerging annual summer weeds

If you were hoping for even a slight break after harvest… think again.

You should already be thinking about what you can do next season to win the war against corn and soybean weeds. Syngenta recommends a threefold battle strategy:

  1. Start clean: You should have already applied a fall burndown to wipe your fields clean. You may also need to apply a burndown in the spring to kill off any winter weeds, such as marestail. Early-emerging summer weeds, including giant ragweed, can also come up around this time if there was a warm winter.
  2. Overlap residuals: If you think you need to wait until weeds appear to use herbicides, then the weeds are winning the war. Use a pre-emergence herbicide to fight weeds before they have a chance to emerge. Then, use an overlapping post-emergence herbicide to extend the length of control. If any weed escapes can be seen in your field, apply your post-emergence herbicide prior to any of them reaching 4” tall.
  3. Utilize multiple effective modes of action: A study from the University of Minnesota found that continuous use of a product for over 2 years could develop an herbicide resistance problem. That’s why Iowa State University recommends utilizing multiple herbicide groups that are effective against specific problem weeds in the field.

What herbicide program is right for you? Resistance Fighter® is an educational herbicide program from Syngenta that can help you decide. Visit www.ResistanceFighter.com or talk to your local Syngenta sales representative to learn more about how to get a customized herbicide program that’s right for the spectrum of weeds on your operation.

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