Surveying and monitoring levels of weed infestation and herbicide resistance in Western Australia (WA) cropping regions provides data that is useful to guide decisions about sustainable herbicide use.
Surveys have been conducted in the WA wheatbelt over the last 20 years to determine the frequency and extent of herbicide resistance in crop weeds. The first surveys were conducted in 1998 and 1999 and examined the frequency of resistance to ACCase and ALS herbicides in annual ryegrass and wild radish respectively.
Subsequent surveys in 2003, 2005, 2010, 2015 and most recently in 2020 have included problematic weeds including ryegrass, wild radish, wild oats, barley grass, bromegrass and fleabane.
For detailed survey information on individual Western Australian cropping zones, please refer to the relevant zone and click.