National Glyphosate Sustainability Working Group, 2005.
Photo: Emma Leonard

 

   what to do if you suspect glyphosate resistance
  When glyphosate resistance is first suspected we advise that growers contact their local agronomist.
 

The following steps are then recommended:

1 Consider the possibility of other common causes of herbicide failure by asking:
> Was the glyphosate applied in conditions and at a rate that should kill the target weed?
>  Did the suspect plants avoid herbicide contact or emerge after the glyphosate application?
> Does the pattern of surviving plants suggest a spray miss or other application problem? If resistance is still suspected:

2 Contact one of the following members of the national Glyphosate Sustainability Working Group for advice on sampling suspect plants for testing and confirmation of the resistance status:

 South Australia:
 Chris Preston, University of Adelaide:
 Phone: 08 8303 7237 Fax: 08 8303 7109
Email: christopher.preston@adelaide.edu.au

New South Wales:
 Southern: John Broster, Charles Sturt University:
 Phone: 02 6933 4001 Fax: 02 6933 2924
Email: jbroster@csu.edu.au  OR

Northern: Tony Cook, NSW Department of Primary Industries:
 Phone: 02 67631250 Fax: 02 6763 1222
Email: tony.cook@industry.nsw.gov.au

Victoria and Tasmania:
 Chris Preston, University of Adelaide:
 Phone: 08 8303 7237 Fax: 8303 7109
Email: christopher.preston@adelaide.edu.au

Queensland:
 Michael Widderick, Queensland DPI&F:
 Phone: 07 4639 8856 Fax: 07 4639 8800
Email: michael.widderick@deedi.qld.gov.au

Western Australia:
 Steve Powles, WAHRI, University of WA:
 Phone: 08 6488 7870 Fax: 08 6488 7834
Email: spowles@plants.uwa.edu.au  OR

Abul Hashem, Department of Agriculture and Food Western Australia:
 Phone: 08 9690 2000 Fax: 08 9622 1902
Email: ahashem@agric.wa.gov.au

3 Ensure suspect plants do not set any seed.

4 If resistance is confirmed, develop a management plan for future years in consultation with an agronomist.

This guide has been produced by the Australian Glyphosate Sustainability Working Group, a collaborative initiative aimed at promoting the sustainable use of glyphosate in Australian agriculture.

The Australian Glyphosate Sustainability Working Group acknowledges the financial support of the GRDC.
   

Updated: 04/02/2010