Pre-harvest Glyphosate Staging Guide for Canola

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.