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glyphosate resistant weed

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Catalogue: GRDC Updates
Herbicide resistance in Southern Australia Recent surveys of southern Australia have identified high levels of herbicide resistance in annual ryegrass... Trifluralin is damaging to wheat if it gets into the crop row, so good separation is necessary between the herbicide and the crop seed... If Trifluralin resistance is not present, it will be important to use these new herbicides for some crops in the rotation so that Trifluralin can be saved for use in crops like canola...
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Catalogue: GRDC Media
Seize opportunity to hunt down weed survivors.. The season is a good year to find glyphosate resistant ryegrass and to employ the double knock technique, according to AHRI communications leader Peter Newman... "Most of the grainbelt has received enough rain in recent weeks to encourage a good germination of winter weeds including annual ryegrass, and many growers will spray glyphosate to control them," Mr Newman said...
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Catalogue: GRDC Media
But with Grains Research and Development Corporation (GRDC) supported surveys indicated escalating weed resistance to herbicides including glyphosate, it is likely some weeds will have survived knockdown sprays... A targeted (not random) WA grainbelt survey, conducted by Sally Peltzer of the Department of Agriculture and Food (DAFWA) in 2013, found that more than 40 per cent of 172 annual ryegrass samples tested had some level of resistance to glyphosate... Growers who find weeds surviving herbicide application should send samples to commercial services for a 'Quick Test' in which plants (mainly grasses) are tested for herbicide resistance...
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Catalogue: Ground Cover
The Grain Orana Alliance (GOA) has shortlisted windmill grass in the five main problem weeds facing growers in the northern grains region... Windmill grass has been confirmed as glyphosate-resistant and it is quickly becoming one of the most problematic weeds in zero-till summer fallows across the northern grains region," Mr Street says... Mr Street says GOA surveys highlight the link between farming systems that use single-mode control techniques and herbicide resistance in windmill grass...
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Catalogue: GRDC Updates
Frost in the few days after clethodim application reduces activity of the herbicide on annual ryegrass.. The best management for clethodim resistant annual ryegrass in break crops is a pre-emergent herbicide followed by a mixture of clethodim plus butroxydim on small ryegrass plants.. Surveys across South Australia and Victoria from 2005 show an increase in incidence of resistance to herbicides in annual ryegrass populations (Table 1)...
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Catalogue: GRDC Updates
The strategy for sampling is to collect from the centre of the suspect patch... The target site resistance mechanism is a single amino acid mutation within EPSPS (the enzyme glyphosate binds to) and typically results in 2 to 5-fold resistance to glyphosate (Figure 1)... Populations can accumulate both mechanisms of resistance and are much more resistant to glyphosate...
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Catalogue: GRDC Media
But with Grains Research and Development Corporation (GRDC) supported surveys indicated escalating weed resistance to herbicides including glyphosate, it is likely some weeds will have survived knockdown sprays... A targeted (not random) WA grainbelt survey, conducted by Sally Peltzer of the Department of Agriculture and Food (DAFWA) in 2013, found that more than 40 per cent of 172 annual ryegrass samples tested had some level of resistance to glyphosate... Growers who find weeds surviving herbicide application should send samples to commercial services for a 'Quick Test' in which plants (mainly grasses) are tested for herbicide resistance...
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Catalogue: Broadacre Field Crops DAFF QLD
The roadside, like much of Australia's 810,000 km of roads, has a 20 year history of using glyphosate alone for weed control... Associate Professor Preston says authorities, councils and communities must start looking at a range of roadside weed management techniques to prevent the development and spread of glyphosate-resistant weeds along roadsides and movement into other sectors of the community... Associate Professor Preston believes more planning needs to go into roadside vegetation management to prevent the development of glyphosate-resistant weeds, while meeting road safety requirements...
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Catalogue: Broadacre Field Crops DAFF QLD
The roadside, like much of Australia's 810,000 km of roads, has a 20 year history of using glyphosate alone for weed control... Associate Professor Preston says authorities, councils and communities must start looking at a range of roadside weed management techniques to prevent the development and spread of glyphosate-resistant weeds along roadsides and movement into other sectors of the community... Associate Professor Preston believes more planning needs to go into roadside vegetation management to prevent the development of glyphosate-resistant weeds, while meeting road safety requirements...
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Catalogue: GRDC Updates (North)
Precision row placement is likely to have its greatest impact on reducing CR and CRR levels in a no-till farming system with the adoption of GPS guided controlled traffic likely to further benefit this approach... Its main impact on crop productivity has been shown to occur through the disruption of the plants ability to use water efficiently to produce grain (Figure 6)... Plant early in areas of low frost risk, such as higher slopes, and reduce the risk of frost damage by planting more than one variety and by varying planting times...
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