Knowing which herbicide modes of action (MOA) are still effective can avoid in-crop herbicide failures and allow growers to develop long term weed management plans

Key points:

• Wild radish is the most problematic weed on the sandplain soils of the northern wheatbelt.
• Multiple resistance to commonly used selective herbicides is increasing in local wild radish populations.
• Incidence of annual ryegrass with Group A (diclofop), Group B, Group D (trifluralin) and multiple herbicide resistance continues to increase across the northern wheatbelt.
• Clethodim (Select®) has had the biggest increase in annual ryegrass resistance levels since 2003 and there is now resistance to high label rates in the northern wheatbelt.
• Testing wild radish and ryegrass populations to assess herbicide resistance status can ensure effective herbicides are applied in-crop and results can be used to help develop management strategies.
• Glyphosate effectiveness, especially, can be protected by monitoring resistance after spraying and using integrated weed control tactics.
• Multiple non-herbicide and herbicide strategies are required within each cropping season to prevent weed and weed seed blow-outs.
• Always use recommended label rates of herbicides to slow the evolution of herbicide resistance and prolong herbicide efficacy.

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Region West, North, South

• 242.91 kbTake the test for herbicide resistanceKnowing which herbicide resistance modes of action (MOA) are still effective can avoid in-crop herbicide failures and allow growers to develop long term weed management plans.