The bad news of resistance keeps rolling on and the latest cases should be providing a wakeup call to producers to lift their management programs.A RECENTLY-confirmed case of annual ryegrass resistant to both glyphosate and paraquat is a warning to producers rotating herbicide modes of action alone does not solve all your herbicide resistance problems, according to researchers.The Australian Glyphosate Sustainability Working Group (AGSWG), supported by the Grains Research and Development Corporation(GRDC), said it was the first case of glyphosate plus paraquat resistance in any weed species in Western Australia and a world-first for winegrapes.The finding was made in a Western Australian vineyard after Department of Agriculture and Food (DAFWA) senior researcher Sally Peltzer was alerted to the problem by the vineyard owner.“It isn’t just vineyard managers who need to be having a serious look at how they use knockdown herbicides, as it raises concerns about broadacre management practices as well,” Dr Peltzer said.
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