Ask a Consulting Arborist Q&A: Leaf, Seed, and Flower Concerns

Q: What are these red dots on the leaves? (Image)

Thursday, July 07, 2016  

Q: I have a tree with what looks like hard, tiny, red, bead-shaped shells in clusters all over the leaves. If you pull them off, it tears holes in leaves. I need to know what it is and how to treat it and get rid of it. Below is a picture of it. I'm not sure what type of tree it is. Possibly a maple.



A: Your email and picture were forwarded to me. The tree is silver maple, and the “bumps” are maple bladder galls caused by a microscopic mite. It doesn’t harm the tree. Control of this situation is done with a dormant oil spray before bud break.