Charles Sturt University
Graham Centre for Agricultural Innovation

Herbicide Resistance

As a service to producers around Australia, CSU conducts screening of weed populations for resistance to commonly used herbicides. Identifying herbicide-resistant weeds enables producers to avoid using herbicides that are no longer effective against herbicide-resistant weeds, and provides valuable information to researchers about the incidence of herbicide resistance. This information is essential to efforts to limit the development and spread of herbicide resistance.

Testing is conducted on seeds submitted to the testing service. At present, the weed species that are routinely screened include annual ryegrass, wild oats, barley grass, brome grass, and wild radish. Seed of other weeds can be submitted for evaluation, but dormancy issues may prevent accurate determination of resistance

Download the 2020 order form.

A summary of findings for previous years can be found in the annual reports:

2001 2002 2003 2004
2005 2006 2007 2008
2009 2010 2011 2012
2013 2014 2015 2016

Questions about the herbicide resistance screening program should be directed to John Broster.

Herbicide Resistance in Australia

Map: Level of herbicide resistance detected by the CSU testing service in samples received 1991 – 2015