How To Determine Herbicide Rotations And Mixtures

When planning a weed control program, herbicides should be selected from groups that use different sites of action to control the same weed and used in successive applications or in mixtures, according to the Herbicide Resistance Action Committee website. The global HRAC has developed a classification system for herbicides based on site of action that the herbicide uses.

Guidelines for the sustainable use of herbicide site of action groups:

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  • Use mixtures or sequential treatments of herbicides having different sites of action. Each herbicide in the mixture should target the same weed species.
  • Consider all chemical control options before planting, in-crop and after harvest.
  • Avoid continued use of the same herbicides, or herbicides with the same site of action in the same field, unless integrated with other weed control practices.
  • Limit the number of applications of a single herbicide or herbicides with the same site of action in a single growing season.
  • Herbicide mixtures and herbicide rotations alone are not enough to prevent resistance. They must be used in a diversified plan than also incorporates mechanical, cultural and biological practices.

Growers and ag retailers should also do the following:

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  • Follow label use instructions, such as application rates, timing and equipment recommendations.
  • Know the weeds in their fields and nearby non-crop areas and tailor their weed control program to weed densities and economic thresholds.
  • Monitor herbicide results and be aware of any trends or changes in weed populations.
  • Maintain detailed field records to confirm cropping and herbicide history.

To view more Best Management Practices, visit HRACGlobal.com.

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