Cotton like substance on de-leafed weeping willow tree??
Hi everyone, My sister has a weeping willow that has been completely de-leafed and has fluffy cotton-like stuff alllllll over the tree with black bugs in lots of the cotton. Theres cotton like stuff laying all on the ground too. We hadn't noticed the tree in this shape until it was already totally demolished. Any ideas what bug does this and do we need to spray or just let it run its course?? Thanks, Judy