I had to take out 2 bushes last week. They were covered with both grey spots that looked chewed and brown rust. I mean completely covered. I don't know how the third one escaped it. What's going on and how do I organically keep it from happening to my remaining bush?
I also have three pieris (mountain andromeda or something like that) that are starting to look bad. I had to prune two of them extensively. The leaves are turning brown; not a dried out leaf, but just brown, then dying after that. I had red mites pretty bad last year. Could that have contributed or is it the same thing that took the rhodes? Also, can any of this affect my nearby roses? I have enough trouble with the black spot! Thanks!