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Integrated Weed Management

Farm fences can’t keep resistance out. Wherever weed seeds can go (blown by the wind or carried by machinery, contaminated seed, hay or animals), so can the mutations that confer herbicide resistance.

Of course on-farm weed control strategies play a vital role in managing the level of resistance in weed populations, but no farm is immune to resistance and its presence isn’t a reflection of the quality of individual farm management.

As the world map shows, resistance is developing wherever broadacre crops are grown.

Half of the 60 wild radish samples received for annual herbicide resistance testing from growers across south-east Australia since 2009 have been verified as resistant to Group B and Group I herbicides.

In Western Australia, 93% of wild radish populations are resistant to one or more modes of action.

Visit our Integrated Weed Management website and use the resistance map to trace the development over the last 10 years and find out how badly your area is affected. The resistance maps have been developed using data obtained from the analysis of weed seed samples sent in from the field for testing. Where a coloured region appears within the map, this indicates the geographic equivalent of shires where at least one test result for herbicide resistance has been carried out for a grower, an agronomist or researcher.