Knowledgebase

Maple leaf spots #409177

Asked June 22, 2017, 8:38 PM EDT

A young Maple tree in our area has red pimples (see photo). Is this a serious problem and how should address this?

Hennepin County Minnesota

Expert Response

The red pimples are galls and do not harm the tree.
https://www.extension.umn.edu/garden/insects/find/insect-and-mite-galls/

Evelyn Locke, MN Master Gardener, Tree Care Advisor, Volunteer Replied June 22, 2017, 9:13 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.

Maple leaf spots #409177

Expert Response

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