Maple Trees

Asked July 9, 2014, 8:55 AM EDT

My 5 year old Maple tree has some kind of tiny raised bumps all over the leaves. I'm assuming it's some sort of bug. What can I do to get rid of it?

Montcalm County Michigan trees and shrubs

1 Response

Most likely these are galls. By the time you see them the insect that has caused them is encased in the gall, where insecticides will not reach it, or has moved on.

There are at least three types of gall that can be found on maple trees. Treatment is not recommended because the insect is not harmful to the tree. Treating will only release unnecessary pesticides into the environment. There is much discussion right now about insecticides killing pollinators. Please read this article.

http://msue.anr.msu.edu/news/how_to_protect_bees_in_my_yard_and_garden

Here is more information about maple leaf gall.

http://ohioline.osu.edu/hyg-fact/2000/2004.html


http://ento.psu.edu/extension/factsheets/leaf-galls-maple

Thank you for using Ask an Expert.