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HRZ trial yields lessons in resistant ryegrass management

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Getting mouldboard ploughing right, the advantage of an expensive herbicide strategy and how not to narrow windrow burn are just some of the initial learnings from a long-term trial in southern Victoria's high rainfall zone... Five years ago, Dr Preston surveyed paddocks in southern Victoria and found some worrying results... "We discovered that 60 per cent of paddocks between Geelong and Hamilton had ryegrass resistant to both group A and group B herbicides," Dr Preston said...