Posted: 20/03/2016 at 16:55
Mine looks just the same. It has been there for perhaps 15 years and needed little attaention, but now it looks just like the one you describe. The leaves are brownish red and limp, with no green on the plant at all.
Sorry, I'm not helping! But you know you are not alone.
Thanks for your comments, Verdun. If it is phytophthora, should I get rid of the plant now to avoid spread to other shrubs? And will it persist in the soil to affect any new shrub I might put in its place?