DavidLMO said:Did it look badly last year? Winter 13/14 was brutal. A plant that old may have had a serious blow as in 1/2 punch. Combined with age, it may have decided to die after some 3rd, unknown punch, did it in..
Chlorosis can make leaves look pretty bad but typically does not on its own cause death of a Rhody or Azalea.
The bulb fertilizer and evergreen spikes should not have done in this plant.
You never answered the question (I don't think) - is it possible there is a dog (new) in the area that decided to use this as a urinal? The way you describe this and the conditions sounds like what happen from dog urine.
You might spread around some Epsom salts and sulphur, water it in, mulch it, add another couple of inches of leaves and pray for it over winter.
Good luck.
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