- I may not be able to help but if you can provide the following information it may give some others here what they need to assist you.
Do you have any photos of when the rose is in bloom?
Do you know the name of the rose?
Do you see any signs of insects/pests?? Spider mites come to mind for me.
Has it been sprayed or treated (or perhaps received over-spray) with any chemicals?
I think this is unlikely but do you water it overhead? (leaf burn)
Has your weather been consistent the past three years that this has happened?
I'm sorry this incident brought you here but the silver lining is that this is a fantastic group full of extremely helpful folk!