I think I have aster yellows in my flax, can I spray anything to stop it from getting worse?

If you are already seeing symptoms of aster yellows in flax, it is too late for any control. The infection would have occurred from aster leaf hoppers that blew in from the south and were feeding 3 or more weeks ago. There are no fungicides available to control aster yellows. In field crops, insecticides are generally considered of little value in management of this disease, as research shows a single insecticide application would have a low probability of being of much value, and multiple applications (as done in horticultural crops) would not be practical in field crops. Because damage is so visible, it is very easy to overestimate the amount of damage across a field, so assess the crop carefully before making conclusions.

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