When does spring wheat reach physiological maturity and when is the proper timing for pre-harvest glyphosate application?

By Andrew Hector, Agronomy Extension Specialist – Cereal Crops, Manitoba Crop Alliance

Properly identifying spring wheat growth stages is important throughout the season, but growth stage identification becomes essential as we near plant maturity and approach the window for pre-harvest activities such as swathing or applying pre-harvest glyphosate.

What is physiological maturity (PM)?

At PM, wheat plants have accumulated the maximum amount of kernel dry weight. Therefore, at this point, final maximum yield has been determined, and no more dry matter is being accumulated in the kernels.

How to identify PM

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