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Pre-harvest Glyphosate Staging Guide for Canola

Use this handy staging guide to determine when grain moisture is less than 30% in Canola crops.

What to Look for

By applying pre-harvest glyphosate at 50-60% seed colour change in the least mature areas of the field, including any areas of regrowth with seed production, growers can be confident grain moisture will be <30%. At this stage, seeds in the main stem will be:

  • Top = green, firm to roll
  • Middle = mostly brown, with some speckling
  • Bottom = completely brown/black

7–14 days after pre-harvest glyphosate application.


General Information

  • Where allowed, glyphosate is registered for pre-harvest weed control and is not to be used as a desiccant
  • Pre-harvest glyphosate may only be applied when grain moisture content is less than 30% in the least mature part of the field, including any areas of regrowth which may produce seed. Applying too early can result in unacceptable product residues in the grain.
  • To avoid unacceptable residue levels, always follow the product’s label for application rate, timing and pre-harvest interval (PHI).
  • Never harvest earlier than recommended – this can increase the risk of unacceptable glyphosate residues in harvested grain.
  • When using glyphosate for pre-harvest weed control in a tank mix with other products, such as Saflufenacil (Heat), the products must still be applied when grain moisture content is less than 30% in the least mature part of the field and must also follow the PHI of the most restrictive product label.

We’re all in
this together.

Do your part to protect the quality and reputation of Canadian crops and help keep markets open for all.

Follow the Keep it Clean 5 Tips to ensure your canola, cereals and pulses are ready for market.