Glyphosate resistance

These guidelines by the Weed Resistance Action Group (WRAG) look to help agronomists and growers maintain efficacy of glyphosate in the UK.

Glyphosate has been around for 40 years and has become one of the most frequently used herbicides across UK crop production.

Globally, over 30 weed species are believed to have developed resistance to glyphosate, although no resistant species haves been identified in the UK.

High-risk practices, however, are often used which could drive the evolution of glyphosate resistance in UK weeds.

In response, guidelines have been produced by the Weed Resistance Action Group (WRAG) to help agronomists and growers maintain UK efficacy. 

The guidelines include four simple and key messages, supported by more detailed evidence and guidance.

Minimising the risk of glyphosate resistance: key messages

One. Prevent survivors: Avoid repeat applications to surviving plants

Two. Maximise efficacy: Apply the right dose rate (reduced rates increase the risk of reduced efficacy), at the right timing, in the right conditions

Three. Use alternatives: Use non-chemical options (such as cultivation), where practical, and use other herbicides in sequence

Four. Monitor success: Remove survivors and report potential resistance issues to your advisor and/or the product manufacturer.

Guidelines for minimising the risk of glyphosate resistance in the UK (full) (2018)

Stewarding glyphosate's future

Glyphosate management to minimise the risks of resistance and residues may prove pivotal when its registration comes up for renewal in 2022. CPM finds out about the research that will shape its usage guidelines.

Stewarding glyphosate's future (T2F July 2018)