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dormant ryegrass

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: 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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