The EPA’s decision to restrict the use of Chlorothalonil could have a lasting impact on dry bean yields. According to NDSU Extension Plant Pathologist Michael Wunsch, losing Chlorothalonil would leave other fungicides used as part of a tank mix almost useless. “So this tank mix is protecting our existing chemistries by reducing the selection pressure on them and giving satisfactory disease management during wet weather. If we lose the Chlorothalonil the pressure goes up on our existing chemistries,” Wunsch said. Dry bean production in North Dakota has come to rely on Chlorothalonil, and while the fungicide has not been removed from shelves, it still remains to be seen just how big of an impact the reduction of use will have.
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