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Glyphosate resistance in Australian brome

The first case of resistance in Australia to the herbicide, glyphosate, in great brome grass ( Bromus diandrus), has been found in the state of South Australia. The resistant grass was found on the site of an old fence line that had been sprayed with glyphosate for many years. The problem had previously been associated with ryegrass ( Lolium rigidum). “The number of glyphosate-resistant ryegrass populations evolving along fence lines is exploding,” says University of Adelaide associate professor Chris Preston, who chairs the Australian Glyphosate Sustainability Working Group. “That, and this new discovery, are a real ‘wake-up call’ and show that any weed might develop glyphosate resistance and growers need to be vigilant.”



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