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weed population

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Catalogue: GRDC Media
Australian cereal growers adopting harvest weed seed control systems (HWSC) are driving down weed populations to lower levels on their farms, and extending the life of the herbicides they use... Dr Walsh said the problem of herbicide resistant weed populations globally was particularly severe in production systems where herbicide dependence resulted in a lack of weed control diversity... "Although herbicides remain the number one weed control tool in Australian cropping systems, it is now clear that the inclusion of HWSC systems in weed management programs is enabling weed populations to be driven to very low levels, providing some insurance for the sustainability of remaining herbicide resources," he said...
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Catalogue: GRDC Publications
Supported by GRDC Grains Research Update for Growers sponsored by.. Having the N isolated from losses due to ammonification, denitrification and leaching means that if the crop really needs the N, it can access it 2014 Lake B o l a c GRDC Grai n s R e s e a rc h U p d a t e f o r G ro w e r s 38 with minimal loss... A fast track project was initiated to demonstrate and evaluate a range of management strategies that Twelve farms were surveyed across the western districts of southern Victoria that were considered suitable as potential trial sites based on grower and adviser recommendations...
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Catalogue: GRDC Final Reports
Several field studies were undertaken in SA and WA to identify promising herbicides for the control of barley grass in wheat... After barley grass was confirmed to be increasing on SA and WA farms, laboratory studies were undertaken to determine the reasons for this trend... The project was designed to identify weeds that were emerging as a threat to productivity of grain crops in SA and WA and to undertake studies to determine underlying reasons for their increasing incidence...
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Catalogue: Ground Cover
New AHRI research shows that wild radish can adjust its flowering time in response to control techniques.. New research in Western Australia shows wild radish ( Raphanus raphanistrum ) is genetically capable of adapting to changing farming systems by modifying its flowering time to ensure survival... "We need to think hard about how we use our current integrated weed management strategies and continually diversify the way we use them," he says Dr Ashworth suggests rotating the seeding order of paddocks, such as seeding the first paddocks last the following season, and using harvest weed-seed control strategies with highly competitive crops...
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Catalogue: Ground Cover
Need for feed could reduce weed burden.. Fodder crops reduce weed-seed numbers in 10-year rotation.. The three-year project, now in its final year, has trialled several different fodder crops including lucerne, arrowleaf, balansa, Persian clover, subclover, annual ryegrasses, peas and oats, serradella, and wheat and barley for fodder...
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Catalogue: GRDC Publications
The trend for increasing herbicide resistance in Australian cropping systems is likely to continue, at least in the near future... The majority of plants in a wild weed population will be susceptible to herbicides effective on that species... Overall, 25 per cent of the samples that were resistant to fenoxaprop and clodinafop also had resistance to flamprop methyl which is in Group Z (Cook 2011)...
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Catalogue: GRDC Factsheets
integrated weed management relies on a range of tactics, both chemical and non-chemical, and multiple attacks to keep weeds successfully in check... recent surveys have shown that ryegrass numbers in paddocks are very low, even where herbicide resistance has been recorded... crop competition Crop competition is driven by crop type and variety choice and works by using crop uniformity, density, vigour and good agronomy to outcompete weeds...
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Catalogue: GRDC Updates
The first population of wild oats resistant to Group A herbicides was in 1986... The costs of herbicide resistance may not be immediately obvious... The use of soil active herbicides in no-till poses a number issues depending on the characteristics of the herbicide, level of incorporation, proportion of the soil covered by plant material or clods and amount of moisture near the soil surface...
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Catalogue: GRDC Factsheets
integrated weed management relies on a range of tactics, both chemical and non-chemical, and multiple attacks to keep weeds successfully in check... recent surveys have shown that ryegrass numbers in paddocks are very low, even where herbicide resistance has been recorded... crop competition Crop competition is driven by crop type and variety choice and works by using crop uniformity, density, vigour and good agronomy to outcompete weeds...
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Catalogue: GRDC Factsheets
integrated weed management relies on a range of tactics, both chemical and non-chemical, and multiple attacks to keep weeds successfully in check... recent surveys have shown that ryegrass numbers in paddocks are very low, even where herbicide resistance has been recorded... crop competition Crop competition is driven by crop type and variety choice and works by using crop uniformity, density, vigour and good agronomy to outcompete weeds...
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