Study Finds Widespread Herbicide Resistant Ryegrass in West Australia
September 21, 2007| |
A study conducted by the Grains Research and Development Corporation (GRDC) found widespread and multiple herbicide resistant annual ryegrass in Western Australia (WA). Grain growers are now faced with severe management and sustainability issues. In less than two decades, the ryegrass across the WA wheat fields has evolved from being susceptible to being resistant to a number of herbicides including Oust and Hoegrass. The study also found that several populations are developing resistance to trifluralin and Select, herbicides used to control Oust and Hoegrass tolerant ryegrass. Although most of the populations are still susceptible to paraquat and glyphosate, the area’s most popular knock-down herbicide, the future challenge is to sustain the effectiveness of these compounds by using more diversified cropping and farming systems, with less overall reliance on herbicides and more integrated management strategies.
Read more at http://www.grdc.com.au/director/events/mediareleases/?item_id=1BF189DEC1AD690BE49600A00E092D6A
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