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How Do You Manage Your Farm Through Weed Resistance?

How Do You Manage Your Farm Through Weed Resistance?

27 February 2014

ANALYSIS - With no new herbicide technology expected in the next five or even 10 years, farmers must manage weed resistance through a systems approach, reports Sarah Mikesell, TheCropSite senior editor.

US farmers have embraced new technologies over the last 10 to 15 years, but then came to use and rely on one mode of action year after year. The result: weed resistance.

Al Luke, Row Crop Marketing Lead at Bayer CropScience, said farmers need to rotate crops, rotate modes of action and rotate traits so that weeds are not exposed to the same chemistry several times in a given year or even year-on-year.  

Indications of Potential Weed Resistance

  • A patch of weeds occurs in the same area year after year and is spreading.
  • Dead weeds appear next to surviving weeds after the same herbicide application.
  • Many weed species are managed, but one particular weed species is no longer controlled. For example, following a glyphosate application, actively growing marestail can still be seen in the absence of other weeds.
  • The field has been sprayed repeatedly with the same herbicide mode of action, particularly if there was no mode-of-action diversity in the weed management system.

Sarah Mikesell is reporting live from Ag Issues Forum in San Antonio, Texas. The forum is hosted by Bayer CropScience in order to bring thought-provoking issues to the forefront of agriculture.

Sarah Mikesell, Senior Editor

Sarah Mikesell, Senior Editor

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