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A combination of tactics may reduce selection pressure. The following are the best ways to mitigate weed resistance, experts say:


  • Use multiple modes of action. Just changing herbicide brands isn't good enough, make sure chemicals are different. Herbicide tolerant crops do not limit the herbicides a grower may use. For example, if glyphostate-resistant waterhemp is the problem, use triazine or a chloracetamide. For horseweed control, try 2, 4-D.
  • Glufosinate is a good broad spectrum herbicide that could be rotated with glyphosate since there have been no reports of glufosinate resistant weeds to date.
  •  Rotate the use of chemicals to prevent resistance build up in weeds. Don't use the same chemicals year after year.
  • Always use the full recommended herbicide rate and apply in a timely manner, if possible.

  • Work closely with local agronomists/chemical suppliers on weed control issues.
  • Control weeds in field waterways, edges and road ditches to prevent weed escapes.
  • Cultivation. Spot till problem areas or pull weeds by hand if necessary. Owen says there are cultivators that won’t increase the risk of soil erosion.
  • Increase crop rotations to break up weed cycles, which also allows farmers to use different modes of action.
  • Clean equipment between fields to prevent spreading weed seed.
  • Use cover crops to provide competition for late fall or early spring weeds.
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