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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 (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: 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... Overall, yields were generally greater for those plots with effective control of weeds and lower weed biomass at anthesis (Tables 1 and 2)... In summary, metribuzin shows some promise for use pre-emergent in lupins but is not currently registered at this timing...
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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
For weeds such as ryegrass, wild oats, and wild radish, this weed seed can be herbicide resistant and it is possible for growers to unwittingly introduce resistance to crop fields... In 2006 a field experiment was established to evaluate the evolution of resistance to diclofop-methyl... Clethodim is widely used to control otherwise resistant ryegrass clethodim resistance is increasing in ryegrass populations (Owen et al. 2007)...
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Catalogue: GRDC Final Reports
Included in the total were 56 populations sent by growers, agronomists and advisers to be screened by the free Herbicide Resistance Testing Service (HeRTS)... The pot assay results showed that all these populations were resistant and the different pattern of resistance indicated that different mutations were likely to be involved... The free herbicide resistance testing service was valued by growers and agronomists and since the project terminated, there have been several enquiries about where such a service can now be obtained...
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Catalogue: GRDC Updates
Previous research in SA had reported resistance to Group A (ACCase inhibiting) herbicides in H. leporinum ... In the paper we will report results of studies conducted to investigate the evolution of herbicide resistance in H. glaucum ... Herbicide resistance was detected in samples collected from fields under crop (11 populations) and pasture (three populations), but cropped fields had a greater frequency of resistance...
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Catalogue: GRDC Final Reports
It is possible that resistance alleles will spread to new areas highlighting the need to monitor field populations throughout the range of H. destructor... We aimed to determine if there is cross-resistance across multiple synthetic pyrethroids as Umina (2007) only tested bifenthrin and alpha cypermethrin... Doses representing the field rate contained 290 mg a.i./L of omethoate and 100 mg a.i./L fipronil...
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