Sir: My wife and I live in a church parsonage surrounded by Sweet Gum trees and two Pin Oak trees. The Oak trees have growths on the branches and twigs that appear to be globs about the size of walnuts and even attract the squirrel population said they were. I am told that it is a disease that is manifested by wasps. I am told that eventually it will kill the trees and there is nothing that I can do to stop it. I do have pictures but other appears to be no way for me to forward them on this site. Please offer your advice. Thank you!