eXtension

Pest on maple?

Asked June 4, 2017, 6:55 PM EDT

Do you know what this disease or pest is causing this on our maple. It goes to top of tree. What can we do about it? Thanks.

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Dakota County Minnesota

1 Response

Thank you for the question. Your maple has tar spot, a fungal disease that is rarely much of a problem for the tree unless it gets so bad that the tree loses all its leaves several years in a row. Management strategies focus on improving cultural conditions, rarely fungicides.

This publication reviews leaf spot diseases and if you scroll down to the bottom, there is a nice section on actions you can take now to minimize this problem and support your trees health: http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/management-of-leaf-spot-diseases/

Thank you for contacting Extension.