The majority of the canola green seed problems in Western Canada are usually the result of frost. Even a light frost can fix the green colour by damaging the enzymes that clear the chlorophyll in higher moisture seed, preventing additional clearing regardless of how favourable weather conditions may become…
Frost
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We don’t really know how much frost (temperature, duration) would be equivalent to an application of diquat (Reglone), but we do know that in cool conditions, diquat may not actually work that well…
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You have two choices in this situation: Swath now or wait. Swathing now might prevent further seed loss if severe frost damage will soon cause pods to pop open and pedicels to snap. You could have shriveled seeds and high green counts, but that might be better than the potential losses from waiting. But if frost did not kill the…