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Black spots on leaves #248092

Asked May 29, 2015, 11:31 AM EDT

My maple tree has black spots on the leaves throughout the canopy. Any idea what they are and are they harmful to anything?

Baltimore County Maryland

Expert Response

Maples get many different spots which do not hurt the tree. This looks like tar spot. http://plantclinic.cornell.edu/factsheets/tarspotofmaple.pdf vw

Answered by the Home & Garden Information Center's Maryland Certified Professional Horticulturists Replied May 29, 2015, 11:38 AM 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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