Herbicide Resistance

Cropping with Herbicide Resistance

Herbicide resistance is a fact of life for growers in the western and southern grains regions, and is spreading through the northern grains region. Integrated weed management can delay or prevent resistance developing by relying on a range of tactics, both chemical and non-chemical, and multiple attacks to keep weeds successfully in check. The GRDC has developed a fact sheet on cropping with herbicide resistance for each of the three grains regions, available below.

Key points

  • –Resistance develops when repeated applications of the same mode-of-action (MOA) herbicide kill susceptible weeds, and resistant weeds survive and set seed.
  • Herbicide resistance will remain as long as there is resistant seed in the soil.
  • Integrated weed management (IWM) is a diverse approach using chemical, non-chemical and agronomy tactics that targets weed seed-set. It is the best way to delay or prevent the development of herbicide resistance.
  • Minimising the number of weed seeds in the soil (the seedbank) by preventing weeds from setting seed is the top priority.
  • Herbicide-resistant weeds are always possible, whether they occur naturally or are introduced via wind, water or contamination. However, consistently applying IWM will achieve a relatively weed-free system.

Region National, North, South, West