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resistant weed

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Catalogue: GRDC Media
Opportunities for growers to broaden weeds approach.. Opportunities exist for grain growers in the southern cropping region to more effectively manage weeds in retained stubble systems, according to new research conducted by the CSIRO and funded by the Grains Research and Development Corporation (GRDC)... Caption: CSIRO Senior Research Scientist (Farming Systems) Dr Rick Llewellyn says a new study has highlighted just how costly weed management has become and where there are opportunities to reduce further cost increases...
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Catalogue: GRDC Media
Opportunities exist for grain growers in the southern cropping region to more effectively manage weeds in retained stubble systems, according to new research conducted by the CSIRO and funded by the Grains Research and Development Corporation (GRDC)... "The data shows very large differences between regions for practices like harvest weed seed control, crop topping and double knockdown which reflects past differences in the levels of herbicide resistance, but we're now seeing resistance issues becoming much more important in all cropping regions," Dr Llewellyn said... Caption: CSIRO Senior Research Scientist (Farming Systems) Dr Rick Llewellyn says a new study has highlighted just how costly weed management has become and where there are opportunities to reduce further cost increases...
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Catalogue: Ground Cover
Many growers have now come to realise that to manage resistant weeds takes a combination of a sound crop rotation, herbicides and non-herbicide weed management... Mr Newman, a weeds research officer with the Department of Agriculture and Food, WA (DAFWA), has led a nine-year, GRDC-funded survey into 31 'focus' paddocks on wheat farms across WA's northern agricultural region, where growers consider resistant weeds just another aspect of farming life. ".. The focus paddocks are skewed towards growers who had problems with resistant weeds and were motivated to do something about them...
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Catalogue: GRDC Media
Mr Storrie says 82 confirmed cases of glyphosate-resistant annual ryegrass have been recorded in winter grain crops including wheat, canola and pulses from NSW to Western Australia. ".. This is the tip of the iceberg, as our most valuable herbicide, glyphosate, has been used for long enough to prime weed populations for resistance," Mr Storrie said. ".. If there is ryegrass still alive after two applications of glyphosate in a canola crop, you have a fair indication they are resistant, but it is a good idea to get a Quick-test@" done as well for suspected problem weeds from other crops and fallows," Mr Storrie said...
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Catalogue: GRDC Final Reports
The project has shown that when small GR weeds are treated with robust rates of glyphosate, less than two percent of the population will survive... The value of rotation in controlling multiple MOA resistance weeds such as wild oats has also been demonstrated... Experiments showed the timing of control is critical in the management of resistant barnyard grass, as glyphosate resistance increases and paraquat # efficacy decreases with plant size...
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Catalogue: GRDC Final Reports
The main IWM tool not widely adopted is crop competition, the major reason being that growers are locked into wide row spacing with their current seeding machinery... As most growers have experienced and accepted the problem, I believe we will be in a better position to implement effective management of resistant weeds in the future... There is renewed interest in chaff carts with 30% of growers surveyed likely to adopt this practice in the next five years...
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Catalogue: GRDC Media
With winter crop harvest fast approaching, growers are being urged to take weed seed samples to help map out an effective weed management strategy for the upcoming season... Taking seed samples from survivor weeds at harvest and sending them off for testing will allow growers to assess their control options for next year," Mr Street said... "Herbicide resistance costs the northern grains industry tens of millions of dollars each year and unless growers understand the resistance status of the weeds on their farm, they can't have full confidence that their normal control measures will continue to work in the future."..
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Catalogue: GRDC YouTube channel
" GCTV10: Harvester Mounted Weed Destructor 03 May 2013 Building a Weed Seed Destructor into the harvester will take HSD technology into the future... HSD, we then did some lab 61.909: testing some computer simulation and we got very good relationships between the speed 66.119: of the cage mill, the size, the design and why it was killing those weed seeds... 144.989: Narrator: Financial support that amounted to one and 147.04: a half million dollars not including monies Ray Harrington initially put into the HSD. 152.92: Initial tests have produced positive results this integrated prototype will require 157.67: further development and testing to evaluate how well it performs at various speeds and 162.709: under different loads. 163.7: Chris Saunders: So from our lab testing we know that the portion 166.69: of kill increases with the proportion of rotational speed and there s a characteristic that s 172.239: specific to our machines and there s a characteristic that specific to the Harrington cage mill...
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Catalogue: GRDC Updates
Growers that have the weed seed bank under control will save herbicide costs; have greater rotational flexibility; have greater options 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 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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