It very well could be herbicide injury or potentially environmental stress damage. Applying herbicides especially those with a broadleaf control component under very hot and humid conditions can damage flax. The growing point may be damaged even more if spraying occurred after flax is 6 inches or taller. Spraying flax when the temperature has not exceeded or is not going to exceed 28C within a 48 hour timeline around the herbicide application will help reduce the injury to flax. Also, only spraying products that are registered on flax will help reduce injury as they have been tested and approved to provide acceptable weed control without causing unacceptable crop injury.
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