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ryegrass seed

Catalogue: Ground Cover
With annual ryegrass costing Australian grain growers more than $360 million a year in control measures, PhD student Joe Moore has joined the effort to look for alternatives to manage the weed's invasive spread.. "If we can establish that the endophyte is contributing to making annual ryegrass more of an invasive weed, it may be that elimination of the endophyte is a viable option for controlling the weed," Mr Moore says... To test if endophytes contribute to making the plant more competitive as a weed, Mr Moore removes the endophytes from annual ryegrass seeds, without damaging the seeds, so they can be grown and used for further experiments...
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Catalogue: GRDC Updates
Results 2008/2009 harvest HSD testing The HSD system proved its potential as an effective at harvest weed seed management system by consistently destroying over 90% of the seed of four weed species present in the chaff fraction during the commercial harvest of a wheat crop... 39 (3.3) 1.0 (0.1) 1 Seed in straw were calculated by difference from seed proportions in grain and chaff samples 2 Proportion of annual ryegrass seed in unprocessed chaff surviving HSD treatment 2009/2010 harvest HSD testing High weed seed destruction levels were maintained by the HSD system when subjected to processing high amounts of chaff during the commercial harvest of high yielding wheat, barley and lupin crops (Table 2)... Conclusion Evaluation of the HSD system in commercial harvest situations has determined this system is highly effective (>90%) in destroying annual ryegrass, wild radish, brome grass and wild oat seed during harvest...
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Catalogue: GRDC Media
Just released trial results have confirmed the efficacy of the Harrington Seed Destructor (HSD) in reducing annual ryegrass emergence, paving the way for its introduction into Australian farming systems... The HSD has been developed by farmer and inventor Ray Harrington with support from the Australian Herbicide Resistance Initiative (AHRI), based at The University of Western Australia, and the Grains Research and Development Corporation (GRDC)... Dr Walsh said that while the trials focussed on ryegrass because it was the most problematic weed in Australian cropping, the HSD was also equally effective in controlling other weed seeds including wild radish, wild oat and brome grass...
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Catalogue: Ground Cover
Dr Graham Brodie working on his prototype microwave weed killer... Dr Graham Brodie from the University of Melbourne has developed the technology, using microwave horn antennae mounted on a trailer... The potential advantages of microwaves are that they generally kill weeds immediately and there are no residues, so potentially restrictive withholding periods for crops would not apply...
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Catalogue: Ground Cover
Need for feed could reduce weed burden.. The southern Victorian high-rainfall zone is facing worsening ryegrass problems as herbicide resistance increases.. Fodder crops reduce weed-seed numbers in 10-year rotation..
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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 Media
AHRI researcher Mechelle Owen said that although other studies had already found evidence of a correlation between dormancy and resistance in annual ryegrass, the AHRI research was the first large scale study to demonstrate the link... "For each population, initial dormancy and change in dormancy over a six-month period were measured, and the resistance status of seedlings to four herbicides was assessed," Ms Owen said... "Intensive cropping programs are likely to select for increased dormancy when knockdown herbicides kill off the proportion of seed which is able to germinate with the opening rains, leaving the more dormant proportion of the population to germinate later in the season, usually in the crop," she said...
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Catalogue: GRDC Publications
The benefits improve crop health and crop competitive ability against weeds and the effectiveness of pre-emergent herbicides... When used as a post-emergent product, little of the herbicide gets to the roots and the control of established weeds is often very poor... benefits arise when the weed is prevented from setting seed as there are no increases to the seedbank and, as a consequence, fewer weeds in the future...
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Catalogue: GRDC Final Reports
1.1) Fitness costs of herbicide resistance in a multiple-resistant L. rigidum biotype The L. rigidum biotype SLR31 exhibits multiple herbicide resistance due to the possession of two mechanisms; an insensitive ACCase target site and enhanced metabolic activity of the detoxifying P450 enzyme family... It is essential that alternate herbicide chemistries are evaluated for their potential to control annual ryegrass and wild radish... As it is likely that the capacity of harvesters will continue to increase, a logical approach to developing an effective weed seed # refer to 'Report disclaimer' grinding system was to focus on processing only the weed seed containing fraction of the chaff...
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Catalogue: Ground Cover
GRDC-supported PhD student Mechelle Owen has built up one of the most comprehensive pictures of the spread of herbicide resistance over the past decade... Ms Owen, who is a senior researcher with the Australian Herbicide Resistance Initiative (AHRI) in Perth, has collected and analysed thousands of weed samples to document their resistance levels to a vast suite of herbicides commonly used across Australia... Research has shown ryegrass seed collected from more heavily cropped paddocks across the grainbelt has higher rates of dormancy and herbicide resistance than those with a lighter or no history of cropping...
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