United States 
I will ask again my Rodie has curling leaves and brown and black spots on the leaves whats wrong?
13 Jun, 2015
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« my Rodie has curling leaves and black and brown spots on the leaves,whats wrong?
Without seeing a pic I would suggest this is probably fungal like the black spot that roses can be prone to.
I've had similar on my rhodo & treated it with Systhane but this is to be withdrawn by 30 Nov '15 in the UK.
I don't know what is available for you in the US.
15 Jun, 2015