Testing for glyphosate resistance

What to do if glyphosate resistance is suspected.

Steve Walker
July 2009

Factsheet summary

A healthy weed plant displaying glyphosate resistance
A glyphosate-resistant weed.
As part of a weed management plan you need to know the herbicide resistance status of key weeds, particularly in your high-risk paddocks.

Consider having your weeds tested for glyphosate resistance if:

  1. paddocks are at risk of glyphosate resistance
  2. there are survivors of a glyphosate application.

Testing is recommended if there is a moderate or high risk of glyphosate resistance.

Testing is also recommended if the other common causes of herbicide failure are not likely, such as:

  • the glyphosate was applied in conditions and at a rate that should kill the target weed
  • the suspect plants avoided herbicide contact or emerge after the spraying
  • the pattern of surviving plants suggests a spray miss or other application problem

You can assess the risk for glyphosate resistance by completing the glyphosate resistance risk questionnaire

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Testing for glyphosate resistance (PDF, 397 kB)

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Last updated 16 August 2012