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resistance testing

Catalogue: GRDC Updates
Ryegrass and sow thistle were evaluated in this project; other weeds such as wild oats, wild radish, mustards, poppy, etc. are also developing resistance in this region... The aim of the project was to capture the current resistance status of a large sample of ryegrass and sow thistle; to key pre-emergent and post emergent herbicides in the western riverina region of SW NSW... What was very interesting was the level of resistance measured in samples with no expected resistance...
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Catalogue: Ground Cover
Author : Sarah Clarry "Successful people manage herbicide resistance.".. "We use variable-rate pH mapping so we can get the right rate of lime applied over the whole paddock," he says... "I hadn't used 23cm row spacings since 2003, as I converted to 30cm spacings in 2004," Mr Fels says. "..
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Catalogue: Ground Cover
Author : Sarah Clarry "Successful people manage herbicide resistance.".. "We use variable-rate pH mapping so we can get the right rate of lime applied over the whole paddock," he says... "I hadn't used 23cm row spacings since 2003, as I converted to 30cm spacings in 2004," Mr Fels says. "..
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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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