Rhubarb disease. Can anyone help?

Two of my rhubarbs have developed orangey brown spots on them.  Some of the leaves are really bad and look like they are dying.  The plants overall look OK.  Can anyone tell me what it is and what I need to do?  These were planted last spring and I did not crop them at all last year and nothing this year either.  Hopefully I have managed to attach a photo.

Thanks Mobilkat.  I think I'll go straight for the fungicide these are not the biggest of plants and I'd like some rhubarb next year.  What do I do to avoid rhubarb rust in the future is it keep moisture off the leaves