Growers are being given an early warning of possible troubles ahead after ryegrass was shown to develop target-site resistance to the ALS inhibitor group of herbicides. Seed collected in 2012 for testing has proved to have this resistance mechanism -the first time it has been found in the UK, reveals weed expert Stephen Moss of Rothamsted Research. "We knew ryegrass had resistance to ACCase herbicides and that there was enhanced metabolism resistance out there," he says.
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