Okay, I am just the average homeowner with no tree experience at all. However, we have a tall tree line at our property line that provides shade and blocks the view of the neighbors. I would like to preserve that. I picked a leaf and identified it via the state conservation dept. When we were outside we noticed some white, small, mushroom or pillow looking things all over the leaves of what I think is an oak. I don't think it has been there before this year but anything is possible. I noticed that the neighbors over the fence have a tree that is shriveled up and brown. I would just like some help figuring out what this is and if I can possibly save these 50+ feet tall trees.