Farmers use a range of herbicides to control weeds however, with repeated and frequent use of the same herbicide or similar types of herbicides, weeds become resistant.
Herbicide resistance is the inherited ability of a plant to survive and reproduce, even after the application of a herbicide.
Australian graingrowers typically struggle with resistant weeds such as ryegrass, sow thistle, brome grass, barley grass, wild oats, wild radish and wild turnip.
In addition, grain receival standards clearly stipulate tolerance levels to the presence of weed seeds.
Sustainable weed control involves using herbicides with different modes of action in conjunction with integrated weed management strategies.
By incorporating diverse crop management strategies, graingrowers mitigate the development and spread of herbicide-resistant weeds.
These strategies include:
Mechanical rogueing methods are very effective when used in conjunction with chemical controls.
In addition, growers also have other options to disrupt weed cycles, such as altering sowing dates, row spacing, harvest times, increasing plant densities and crop rotation.
District agronomists, who are familiar with resistant weeds in the region, can provide guidance on the best management strategies and herbicide options.
Growers should always follow recommended application rates, adhere to withholding periods, check the weather to ensure efficacy and prevent spray drift and always follow safety data sheet instructions.
For more information about submitting and testing suspected resistant weed samples, please contact firstname.lastname@example.org
- The Grains Farm Biosecurity Program is an initiative of the Department of Primary Industries and Regions SA, Plant Health Australia and Grain Producers Australia to improve the management of, and preparedness for, biosecurity risks in the grains industry at the farm and industry levels.
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