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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 Australian 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 DPI:
Phone: 02 6763 1174 Fax: 02 6763 1222
Email: tony.cook@dpi.nsw.gov.au

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

Michael Widderick, Qld DAF;
Phone: 07 4639 8856 Fax: 07 4639 8800
Email: michael.widderick@daf.qld.gov.au

Western Australia:
Powles, AHRI, University of WA:
Phone: 08 6488 7870 Fax: 08 6488 7834
Email: stephen.powles@uwa.edu.au  OR

Abul Hashem, Department of Agriculture and Food Western Australia:
Phone: 08 9690 2000 Fax: 08 9622 1902
Email: abul.hashem@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 AGSWG gratefully acknowledges the support of the GRDC and Bayer CropScience, DuPont Pioneer, Dow AgroSciences, Monsanto Australia, NuFarm Australia and Syngenta Crop Protection Australia.


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