One of my lemon trees has been producing new flushes of growth every month or so. The problem is, when the leaves are approximately half way through their development, they get yellow and black spots on them, which looks like a fungal attack. I have been spraying the tree with copper to try to eliminate it, but it keeps happening. It doesnt seem to kill the leaves, but they end up stunted or deformed. Also, where the tree recently dropped some leaves (a month or two ago) The tree has developed open "wounds" in a few places, that ooze a clear sappy liquid, which harden almost like mini icicles on the tree. If i remove them, it oozes more and then hardens. The wounds do not seem to be healing at all, and i have no idea how they developed. I'll post pictures later today. Any thoughts on what the problem is, and how to treat it?