Knowledgebase
our darling maple sapling #875638
Asked July 02, 2024, 11:40 AM EDT
Washington County Minnesota
Expert Response
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/maple/index.html
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/maple/leavesspots.html
It appears that an insect may be eating parts of the leaves, but a single leaf turning purple is a puzzle. You can submit a sample to the Plant Disease Clinic. There is a fee for this service.
https://pdc.umn.edu/
Or consult a local arborist. https://www.treesaregood.org/findanarborist