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How long does it take to evolve glyphosate resistance in annual ryegrass? AIMS METHOD RESULTS CONCLUSIONS REFERENCES

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Glyphosate resistance in annual ryegrass and other weeds is fast increasing in Australia... Resistance may result from immigration of resistant genes, not just from repeated applications of herbicides from the same mode of action... Since glyphosate resistance in weeds is so important for farming systems of Western Australia, it is necessary to know how many annual applications of glyphosate (at low and high rates) are required to develop glyphosate resistance in annual ryegrass in the absence of cropping, grazing and application of herbicides from other modes of action...