Hi, I have an oak tree that has fuzzy growths on the leaves. They look like...
Hi, I have an oak tree that has fuzzy growths on the leaves. They look like cotton. I thought they were galls but I just see a little seed like thing inside. What could they be? If they are galls can you give me a little more information such as what insect, how long do the take to mature? Is the gall specific to a tree species or to an insect? Photos attached.
Wright County Minnesota
The growth is the wooly oak gall. They rarely harm the tree and treatment is not recommended.
The gall is specific to oak trees and a specific insect lays its eggs on oak. The gall is the oak leaf response to an insect that lays its eggs on oak leaves.