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paraquat

Catalogue: GRDC Updates
Growers that have the weed seed bank under control will save herbicide costs; be able to use diverse tactics that would otherwise be cost prohibitive; and, by reducing the frequency of herbicide applications, will delay the onset of herbicide resistance... With any discussion on managing resistance we need to start with the basics and understand why we have the problem in the first place... Registration of high application rates by this technique may allow the control of resistant weeds that have survived a preceding application of a different mode of action...
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Catalogue: GRDC Final Reports
In total, detailed dose response experiments were conducted on 25 populations of annual ryegrass that were suspected of being resistant to glyphosate... Dose response experiments examining populations with different resistance mechanisms showed that the target site mutation in SLR 77 resulted in a population that is less resistant to glyphosate compared with populations containing the reduced translocation mechanism, such as NLR 70... Using a knockdown rotation of the double knock in one year and glyphosate alone in the next year is predicted to result in glyphosate resistance occurring after 26 years for the translocation mechanism and more than 40 years for the target site mechanism (Figure 20)..
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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 Media
Following widespread germination of weeds triggered by autumn rain, Western Australian growers must take every opportunity to use the knockdown herbicide paraquat instead of relying solely on glyphosate... "We must take every opportunity to give glyphosate a rest," he said... "Where grasses are at the one to two-leaf stage and broadleaf weeds are at the cotyledon to two-leaf stage, paraquat products as a single knock are a great option for cost effective weed control while giving glyphosate a rest," he said...
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Catalogue: GRDC Media
A just confirmed case of annual ryegrass resistant to both glyphosate and paraquat is a warning to all farmers that 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 wine grapes... AGSWG executive officer Andrew Storrie said the multiple herbicide resistance appeared to have been caused by 20 years of unplanned rotating of paraquat and glyphosate when treating the vine row strip...
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Catalogue: GRDC Updates
Take home messages Surveys of herbicide resistant annual ryegrass Recent surveys of cropping regions in South Australia, Victoria and WA have indicated that most farms have annual ryegrass with resistance to Groups A or B (Table 1)... Resistance to Dims is increasing, including resistance to Select... Resistance to trifluralin is high in South Australia, but lower in other areas...
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Catalogue: GRDC Publications
The economics of chasing protein, improving nitrogen use efficiency and timing... GRDC Grains Research Update Mungindi, March 2014 Contents.. Overall, populations increased five times compared to before planting the summer crops, but remained below 250/kg soil (Figure 4)...
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Catalogue: GRDC Media
Mullewa grower John Flannagan says that if you can find glyphosate resistant weeds you can manage them... "If you can find glyphosate resistant weeds you can manage them," said Mr Flannagan, who in the last 15 years has twice found patches of glyphosate resistant ryegrass on properties that they own or lease... "In the early 2000s and then again in 2009 we found patches of glyphosate resistant ryegrass on two different properties," Mr Flannagan said...
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Catalogue: GRDC Updates
Although residual herbicides will limit re-cropping options and will not provide complete control, they are a key part of successful fallow management.. The experiment showed that some of these populations were still only suppressed when sprayed with 12.8_L/ha... The most recent survey has focused on non-cropping situations with a large number of resistant populations found on roadsides and railway lines etc where glyphosate alone has been the principal weed management tool employed...
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Catalogue: GRDC Final Reports
Australian growers consistently identify herbicide resistance as a major constraint to cropping... We propose that the resistance is primarily due to sequestration of paraquat, limiting paraquat translocation within the plants... Following the recent completion of the 3-year GRDC postdoctoral fellowship, I have been employed by WAHRI as a Research Fellow to continue working on herbicide resistance at the biochemical and molecular levels...
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