Pre-harvest Glyphosate Staging Guide for Canola

Aug 16, 2023

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
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.

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