I have a small peach tree orchard. Today I went back there to cut the grass, and I found one plant with a peculiar problem I have never seen on peach trees before. It looked from a distance like a branch of the tree was embedded in thick spider webs, but when you got closer, you could see that there were many worms embedded in the white thready mess, plus a butterfly or two. It was killing the branch it was on (I pruned that branch from the tree). What is this problem? And aside from pruning the branch off the tree (which is already done), what can I do about it? I have a bunch of fruit treees back there, 30 feet from one another, so I really don't want this problem spreading to other trees.