Knowledgebase

What’s on my maple tree ? #869829

Asked May 23, 2024, 5:16 PM EDT

There is a black fungus all over the tree , what is it and can I do anything to help it?

Anoka County Minnesota

Expert Response

It's likely tar spot, a primarily cosmetic fungal disease that does not threaten the health of the tree. No treatment is necessary:
https://hort.extension.wisc.edu/articles/tar-spot/
https://yardandgarden.extension.iastate.edu/encyclopedia/maple-tar-spot
https://extension.purdue.edu/news/county/whitley/2022/08/large-spots-on-maple-leaves-that-look-like-tar.html

Dennis in St. Louis Park Replied May 23, 2024, 5:32 PM EDT

Awesome news thank you!!!

On Thu, May 23, 2024 at 4:32 PM Ask Extension <<personal data hidden>> wrote:

The Question Asker Replied May 23, 2024, 5:44 PM EDT

This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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