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Catalogue: GRDC Media
Glyphosate resistance survey finds SA growers at risk.. The random survey, conducted by the University of Adelaide and funded by the Grains Research and Development Corporation (GRDC), has shown it is time for farmers to make significant changes to weed management to halt this problem... "We knew there was some glyphosate resistance in the area from previous work," stated Associate Professor Chris Preston of the University of Adelaide and project leader, "but this surprised all of us and has set the alarm bells ringing to bring in changes to weed management...
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Catalogue: GRDC Media
It is understandable why growers are keen to control weeds along fence lines and crop margins... AGSWG Chairman Dr Chris Preston, from the University of Adelaide's School of Agriculture, Food and Wine, says the main factors that contribute to glyphosate resistant weeds are: intensive use of glyphosate; lack of competition; no other effective herbicides employed; and little or no other weed control practices employed... Many growers prefer to use glyphosate alone for weed control on fence lines due to its ease of use and low cost," Dr Preston said. "..
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Catalogue: GRDC Media
It is understandable why growers are keen to control weeds along fence lines and crop margins... AGSWG Chairman Dr Chris Preston, from the University of Adelaide's School of Agriculture, Food and Wine, says the main factors that contribute to glyphosate resistant weeds are: intensive use of glyphosate; lack of competition; no other effective herbicides employed; and little or no other weed control practices employed... Many growers prefer to use glyphosate alone for weed control on fence lines due to its ease of use and low cost," Dr Preston said. "..
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Catalogue: Ground Cover
Ryegrass resistance survives the double knockdown.. Using a double knockdown (glyphosate followed by a paraquat 'second knock') will not prevent ryegrass developing resistance to glyphosate... "Perhaps the simplest strategy to slow down the onset of resistance is to avoid bringing the three drivers together - intensive use of glyphosate, little or no tillage and no other effective herbicide," says Dr Preston...
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Catalogue: GRDC Media
Glyphosate resistance survey finds SA growers at risk.. The random survey, conducted by the University of Adelaide and funded by the Grains Research and Development Corporation (GRDC), has shown it is time for farmers to make significant changes to weed management to halt this problem... "We knew there was some glyphosate resistance in the area from previous work," stated Associate Professor Chris Preston of the University of Adelaide and project leader, "but this surprised all of us and has set the alarm bells ringing to bring in changes to weed management...
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Catalogue: GRDC Media
If there are multiple areas in a paddock, Dr Preston recommends testing them separately because resistances can vary across a paddock and so the combined result may not reflect the separate patches of resistance... In terms of cost-effectiveness of resistance testing, Dr Preston says if growers have a paddock of concern and want to know what herbicide options are available, then testing three or four options can be helpful... "To test for 3-4 herbicides, that will cost $350 to $400 which is a lot cheaper than spraying the paddock," he said...
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Catalogue: GRDC Media
Herbicide resistance testing: autumn 2014.. In terms of cost-effectiveness of resistance testing, Dr Preston says if growers have a paddock of concern and want to know what herbicide options are available, then testing three or four options can be helpful... "To test for 3-4 herbicides, that will cost $350 to $400 which is a lot cheaper than spraying the paddock," he said...
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Catalogue: GRDC Media
Researchers are investigating strategies to counter the "alarming" level of resistance to the herbicide clethodim which is being detected in annual ryegrass in the southern cropping region... To address the issue, Dr Chris Preston, from the University of Adelaide, and a team of researchers have been looking at new alternative herbicides for canola as well as alternative herbicide strategies in break crops... "We are currently working with some potential new ryegrass herbicides for canola," said Dr Preston who has been speaking about the latest developments at recent GRDC grains research Updates...
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Catalogue: GRDC Media
Researchers are investigating strategies to counter the "alarming" level of resistance to the herbicide clethodim which is being detected in annual ryegrass in the southern cropping region... To address the issue, Dr Chris Preston, from the University of Adelaide, and a team of researchers have been looking at new alternative herbicides for canola as well as alternative herbicide strategies in break crops... "We are currently working with some potential new ryegrass herbicides for canola," said Dr Preston who has been speaking about the latest developments at recent GRDC grains research Updates...
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Catalogue: GRDC Media
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...
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