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Catalogue: GRDC Updates (West)
KEYMESSAGES While resistance in annual ryegrass is common throughout the wheatbelt, resistance to some herbicides like glyphosate or paraquat/diquat is still rare in WA... Safeguard ryegrass could be used to increase the density of ryegrass in the following year, as it is susceptible to glyphosate (and resistant to ARGT)... Most of the pollen was produced by the resistant plants in the vineyard, and there was a very high chance of susceptible plants cross-pollinating to resistant plants...
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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: Ground Cover
Paraquat resistance hits ryegrass.. Dr Qin Yu and colleagues at WAHRI have been testing the paraquat resistant ryegrass to try and establish its mechanism of resistance... Photo: Exploring the mechanisms of resistance: Drs Qin Yu (left) and Shaobai Huang preparing samples of paraquatresistant ryegrass...
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Catalogue: GRDC Updates
Table 1: The year in which the property was monitored, the enterprise practiced in the fields surrounding the vineyard/orchard, the grazing management of the pasture fields and the ARGT management practices... Safeguard ryegrass could be used to increase the density of ryegrass in the following year, as it is susceptible to glyphosate (and resistant to ARGT)... Most of the pollen was produced by the resistant plants in the vineyard, and there was a very high chance of susceptible plants cross-pollinating to resistant plants...
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Catalogue: GRDC Updates (West)
P4/S9 and P2/S4 were the two most profitable sequences and, overall, the 'maximum profit - P4' philosophy had the highest mean gross margin... It is logical that those growers that have chosen to have no livestock will have no interest in trialling grazing crops... Overall, the data has indicated that for the biserrula inoculant all of the carrier's have difficulties in carrying enough live rhizobia numbers to adequately nodulate the legume hosts after 3-4 months of dry, hot soil...
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