At the first of the season my lantana was beautiful. Planted in clay soil it has always done very well over the years but this year the upper leaves on the branches turned black and most the leaves had a white look, like I had sprayed with sevan spray which I hadn't. They stopped blooming and I cut the branches back and they grew back but looking the same as before. Could this be caused by the unually wet spring and summer or is there a fungus with lantana now? Thanks for your thoughts on this subject.