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Catalogue: GRDC Media
SA sowthistle populations confirmed resistant to 2,4-D.. Resistance to the Group I herbicide 2,4-D in sowthistle has been confirmed in South Australia... A major weed of cropping systems north of Dubbo in New South Wales for more than 15 years, sowthistle is now considered a significant emerging weed in southern and western farming systems and will be a focus of the Grains Research and Development Corporation's project on the evolution mechanisms and inheritance of herbicide resistance being led by Dr Chris Preston who is based at the University of Adelaide...
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Catalogue: GRDC Updates
Efficacy of pre-emergent herbicides in different environments** Over the past five years we have been investigating alternative herbicides for control of trifluralin in annual ryegrass... wagga preston Figure 1: Performance of pre-emergence herbicides on trifluralin-resistant annual ryegrass at Roseworthy, SA (higher rainfall site, left) and Berriwillock, Vic (lower rainfall site, right) in no-till wheat sown using knife points and press wheels... Performance of pre-emergence herbicides on brome grass at Wokurna, SA (left) and Waikerie, SA (right) in no-till wheat sown using knife points and press wheels...
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Catalogue: GRDC Updates
Survival of annual ryegrass plants collected at various distances into the crop to different rates of glyphosate (where glyphosate rates are measured as glyphosate applied in gram active ingredient per hectare).. In order to identify alternative herbicide controls for growers who prefer a herbicide option to other management practices, we conducted two field experiments to assess the effect of glyphosate mixtures and other herbicide mixtures in controlling glyphosate resistant annual ryegrass on some fence lines in South Australia... Alternative herbicides for control of glyphosate resistant annual ryegrass on fence lines Two sites were used for this experiment: Ungarra on the Eyre Peninsula and Hilltown near Clare...
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Catalogue: GRDC Final Reports
Glyphosate resistance occurs where there is intensive use of glyphosate, no other effective herbicides and no other weed management tactics used... Continued use of glyphosate will increase the frequency of glyphosate resistance in populations... The project has confirmed that glyphosate resistance is most likely to occur where glyphosate is used intensively and no other effective weed control is practiced...
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Catalogue: GRDC Final Reports
The project has demonstrated over-reliance on glyphosate will lead to glyphosate resistance evolving... The dose response experiments showed that 76 of the annual ryegrass populations were resistant to glyphosate, as were 22 of the barnyard grass, two of the liverseed grass and two of the windmill grass populations... The field trial sites were used for field days for growers and industry in both years...
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Catalogue: GRDC Media
Resistance to the Group I herbicide 2,4-D in sowthistle has been confirmed in South Australia... A major weed of cropping systems north of Dubbo in New South Wales for more than 15 years, sowthistle is now considered a significant emerging weed in southern and western farming systems and will be a focus of the Grains Research and Development Corporation's project on the evolution mechanisms and inheritance of herbicide resistance being led by Dr Chris Preston who is based at the University of Adelaide... Dr Preston said recent testing of five sowthistle populations from SA had confirmed three populations resistant to solid rates of 2,4-D...
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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture and Food, Western Australia... In the lupin/wheat rotation, where simazine or atrazine are used in lupins, it follows that no diuron, bromoxynil or terbutryn is to be used in the cereal... Burning entire crop stubbles results in a high risk of wind erosion and is not recommended for most paddocks in Western Australia...
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Catalogue: GRDC Final Reports
Overall, 64-70% of the cultivar x herbicide combinations resulted in no significant yield losses at both recommended and double rates... 9-10% of the cultivar x herbicide combinations had significant yield losses at the recommended rate in one or more trials... In summary, 70% of the wheat x herbicide combinations and 64% of the barley x herbicide combinations had no significant yield losses at both the recommended and double rates...
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Catalogue: Ground Cover
Double-knock to beat glyphosate resistance.. Growers can reduce the spread of glyphosate-resistant weeds and sustain the effectiveness of glyphosate by using two or more herbicides as part of a double-knock strategy... Mr Cook said there were several suitable herbicide and non-herbicide options to choose from but recommended using a double-knock strategy, with two different groups of herbicides, such as Group L in conjunction with glyphosate (Group M) on glyphosate-susceptible plants...
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