|Fallen ash leaves infected with anthracnose. |
M. Grabowski, UMN Extension
There is no management needed for trees suffering from anthracnose. Although the disease can be somewhat unsightly, it is only a minor stress on the tree. As the weather becomes warm and dry, tree leaves are able to mature without infection. Once leaves are mature they are largely resistant to the anthracnose fungi. Even trees that have dropped many leaves due to infection will produce a new flush of leaves and recover with warm summer weather.