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RSS By: Farm Journal Agronomists, Farm Journal

Have your agronomic questions answered by a Farm Journal agronomist. E-mail us directly at, and we’ll respond on this blog to provide an interactive dialogue.

Use More Than One Chemistry For Weed Control

Nov 12, 2010

Question: I had more of a weed problem this year than I’d expected and could really see them from the combine. I probably should go to something other than only glyphosate next year, but the price is hard to beat. What do you suggest?

Answer: This is a good time to be thinking about what you want to do for weed control next season. Definitely rethink the tactic of using only glyphosate. It’s a great product, but you are doing yourself a disservice using only that herbicide—or any other single product. The best way to protect against yield losses from early season weed competition is the use of an early pre-plant herbicide application. Herbicides applied early preplant do not necessarily require incorporation and can be applied when it is too early to plant and before weeds begin to germinate.  Furthermore, the probabilities of timely rainfall necessary to move the herbicide into the active weed seed bank are high. That way, when weed germination occurs, the herbicide is in position to control the weeds. Early preplant herbicides will control many of weeds that germinate first during the season.  The first weed germination flushes occur in greatest numbers and are most detrimental to potential crop yields.  As a result of the early preplant herbicides, crops are protected from yield-robbing weeds and you’ll have more time to make post-emergencewhether applied early preplant or otherwise, will provide season long control of weeds.  Soil-applied residual herbicides applied early preplant can also delay or minimize the risk of weeds becoming resistant to routine applications of post-emergence herbicides.
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