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