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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