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The grasses Echinochloa colona (L.) Link, Chloris virgata Sw. and C. truncata R. Br. are major problems in summer fallows of the sub-tropical grain region of Australia. Traditionally, these weeds were treated with glyphosate alone, but E. colona and C. truncata populations have evolved glyphosate resistance, and the weed flora is also being dominated by the glyphosate-tolerant species C. virgata....
In the last decade, Conyza bonariensis has become a widespread and difficult-to-control weed in Australian broad-acre cropping, particularly in glyphosate-based zero-tilled fallows of the subtropical grain region. The first Australian populations of C. bonariensis, where it is known as flaxleaf fleabane, were confirmed resistant to glyphosate in 2010. Control with alternative herbicides in fallows...
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