Incidence of Herbicide Resistance in Rigid Ryegrass (Lolium rigidum) across Southeastern Australia

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ACCase-inhibiting herbicides: mechanism of action, resistance evolution and stewardship (2021, background): “rigidum populations even before the herbicide was launched in 2006 as shown in studies from 2003 and 2005 (Boutsalis et al., 2012).”
Understanding the potential for resistance evolution to the new herbicide pyroxasulfone: Field selection at high doses versus recurrent selection at low doses (2012, background): “Herbicide resistance in L. rigidum and other weedy Lolium species is very extensive in Australia (Broster & Pratley, 2006; Owen et al., 2007; Boutsalis et al., 2012) and prominent in other parts of the world (Sherwood & Jasieniuk, 2009; Kaundun et al., 2011; Heap, 2012).”
Multiple herbicide‐resistant Lolium rigidum (annual ryegrass) now dominates across the Western Australian grain belt (2014, background): “Similar large-scale random surveys on L. rigidum resistance conducted in grain-growing regions of other Australian states have also found widespread ACCase- and ALS-inhibiting herbicide resistance (Broster et al., 2011; Boutsalis et al., 2012).”
Herbicide Metabolism: Crop Selectivity, Bioactivation, Weed Resistance, and Regulation (2019, background): “Metabolism-based resistance in L. rigidum from Australia has evolved to wheatselective ACCase and ALS herbicides with a mosaic of different cross-resistance and inheritance patterns indicative of multiple resistance genes and pathways (reviewed in Yu and Powles 2014).”