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Anthracnose arrives with spring rains

 M. Grabowski, UMN Extension

Fall leaves, brown leaf spots, and twisted distorted leaves are all symptoms that gardeners may be seeing on shade trees like oak, ash and maple. These symptoms are caused by anthracnose, a fungal disease that affects young growing leaves during wet weather. No management is needed as anthracnose is not a major threat to the health of the tree. As leaves mature they become resistant to the fungal pathogens that cause anthracnose. Warm dry summer weather will help to further reduce disease problems.
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