In cereals, glyphosate applications can reduce green material, including immature tillers, and improve harvest efficiency and grain storage. This can be particularly valuable in wet seasons.
Only use glyphosate when the grain has less than 30% moisture content. This coincides with the ‘hard dough’ stage (Growth Stage 87) of grain maturity and normally occurs one to three weeks prior to harvest. Use the following visual tests to guide whether a crop is at or below 30% moisture content:
- The peduncle test (wheat and barley): When the peduncle, situated at the top of the stalk (immediately below the ear), starts to lose its green colour and turns brown.
- The thumbnail test (wheat, barley and oats): When a thumbnail indentation holds on 20 grains collected from various areas in the crop (from the centre of each ear).
- The split grain test (wheat): When grains are cut in half and 75% have a dark brown pigment strand in the crease, the grain has reached 30% moisture. If all the grains are marked, moisture content is estimated at below 30%.
The statutory harvest interval is seven days. Some crops, particularly wheat, may require up to 14 days for the glyphosate to be fully effective. This longer interval is more likely under dull and overcast conditions and/or when broad-leaved weeds are present.
Target weeds should be green, healthy and actively growing. Weeds that have senesced, died back or are suffering from drought may not be as susceptible. Ensure the dose is matched to the weed species present (check the product label).
Reference: https://ahdb.org.uk/knowledge-library
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