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double knock

Catalogue: Ground Cover
Strategic tillage has emerged as a recommended approach to tackling glyphosate-resistant weeds in the subtropical grains region of Queensland and northern New South Wales... Dr Steve Walker of the Queensland Alliance for Agriculture and Food Innovation at the University of Queensland said trials with flaxleaf fleabane showed that irrespective of method (harrows, tynes or one-way discs), strategic tillage could dramatically reduce weed emergence... Dr Walker said there was a similar trend with barnyard grass, although the reduction in weed emergence was not as significant...
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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 YouTube channel
0.969: Jane Drinkwater: Narrator The problem of Glyphosate resistant summer 3.04: grasses is becoming one of the most pressing issues that growers currently face... 8.509: Australia currently has three species of summer grass confirmed as Glyphosate resistant - liverseed 14.059: grass, windmill grass and awnless barnyard grass... 17.279: Michael Widderick: Principal Research Scientist QDAFF Toowoomba 18.3: Recently there's been a survey conducted just on barnyard grass and it showed that out of 22.73: approximately 80 samples collected randomly across the region, sixty percent of those 27.839: were Glyphosate resistant...
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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 Media
But with Grains Research and Development Corporation (GRDC) supported surveys indicated escalating weed resistance to herbicides including glyphosate, it is likely some weeds will have survived knockdown sprays... A targeted (not random) WA grainbelt survey, conducted by Sally Peltzer of the Department of Agriculture and Food (DAFWA) in 2013, found that more than 40 per cent of 172 annual ryegrass samples tested had some level of resistance to glyphosate... Growers who find weeds surviving herbicide application should send samples to commercial services for a 'Quick Test' in which plants (mainly grasses) are tested for herbicide resistance...
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Catalogue: GRDC Publications
*The information presented in this publication is distributed by DAFF only as an information source about research that has been conducted in relation to FTR. DAFF disclaims all responsibility and all liability (including without limitation liability in negligence) for all expenses, losses, damages and costs you might incur as a result of relying upon it... Overseas research shows that microbes may have built up in some soils to a point where residual breakdown is measured in days instead of weeks for certain target weeds... The information and data presented in this document represent the cumulative R&D outputs of current and past GRDC and DAFF Qld funded projects, beginning with a grass weeds research project (led by V. Osten) focussing on FTR in 2003 and culminating with the CQ Grower Solutions project that started in 2011...
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Catalogue: Ground Cover
Weed-free summer fallows set up crops.. The benefits of capturing summer rainfall when it occurs and the long-term advantages of keeping the weed seedbank low are driving the need to use double-knock herbicide applications to manage weeds in the summer fallow... Kellerberrin grain growers Scott and Ann Dixon see a lot of value in controlling weeds and storing moisture during summer as the long-term trend is a decline in growing-season rainfall in their area...
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Catalogue: GRDC YouTube channel
" IWM: Double Knock Applications - a Grower's Experience 11 November 2013 Jamie Grant, (Qld grower) using the 'double knock' tactic for effective weed control in summer fallow... Technology to reduce spray drift GCTV: Drift Reducing Technology..
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Catalogue: GRDC Media
Virtually all of Western Australia's grain growing areas received enough rain in April to achieve a solid germination of winter weeds, providing growers with a golden opportunity to control weeds early... Research worldwide and by the Australian Herbicide Resistance Initiative (AHRI), funded by the Grains Research and Development Corporation (GRDC), has demonstrated the importance of using full label rates - to help ensure that herbicides are lethal against weeds... AHRI research has demonstrated that a double knock is one of a number of aspects of good weed management strategies and that growers need to develop a long-term plan to declare war on weeds using chemical, cultural and mechanical methods...
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