Answer: There's at least one fungus I know of that causes such symptoms, but without seeing it myself, I can't say for sure what's causing the problem. If it's covering and killing the leaves on this already weakened plant, you should have the problem identified so you can try to save the bush. Your county agricultural extension office (ph# 913/843-7058) can advise you how to prepare a sample and where to send it for diagnosis. Best of luck to you!
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