Spots on Maple Leaves - Ask Extension
What are these red bumps/spots on my red maple leaves? Is it harmful to the tree? Do I need to do anything to prevent damage to the tree? I've had the...
Knowledgebase
Spots on Maple Leaves #873586
Asked June 18, 2024, 11:11 AM EDT
What are these red bumps/spots on my red maple leaves? Is it harmful to the tree? Do I need to do anything to prevent damage to the tree? I've had the tree four years, and the bumps were also there last year.
Anoka County Minnesota
Expert Response
It looks like your maple tree has galls. These are caused by insects. Galls impact to trees is typically minimal and no treatment is necessary. Below is a link to information about galls.
https://extension.umn.edu/yard-and-garden-insects/insect-and-mite-galls
https://extension.umn.edu/yard-and-garden-insects/insect-and-mite-galls
