Source: Australian Glyphosate Sustainability Working Group

Eight populations of flax-leaf fleabane (Conyza bonariensis) have been confirmed resistant to glyphosate in parts of Australia. This is the fifth weed species to be confirmed resistant to glyphosate in Australia in the past 10 years, with four being found in the past three years, and is the first glyphosate resistant broadleaf weed found in Australia.

This should ring alarm bells with no-till farmers and road managers whose heavy reliance on glyphosate as their herbicide-of-choice continues unabated.

Steve Walker of the University of Queensland, whose team made the discovery, says that growers must be even more vigilant in their spring and summer weed control because these weed seedlings can withstand up to eight times the normal rate of glyphosate. In other words, the glyphosate just won't work!

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