I am too, having problems with Black Spot and also spider mites. My garden shop will not take them back which is a policy with smaller garden shops. I bought 7 plants, I think the best thing to do is just get rid of them. I live in a very dry enviroment, that is why I bought them, thinking that they would be just fine. I will do the research the next time. I am so sorry that I identified these bugs as spider mites, I was incorrect. They are mealy bugs.