Pre-Harvest Glyphosate Staging Guide

Glyphosate applied earlier than the recommended timing for pre-harvest can cause residue issues. Before grain moisture reaches 30%, the plant has not reached physiological maturity, meaning grain filling is still ongoing. If glyphosate is sprayed at this stage, there are risks of glyphosate translocating into developing seeds. This can cause herbicide residue levels in the grain to exceed the MRL (maximum residue level) set by the markets.

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).

  View: Keep it Clean’s handy staging guide.