Answer: Browning leaves can indicate salt burn (from salt in the water or over-fertilization). But, they can also indicate the beginnings of a fungal or bacterial disease. Since it's difficult to diagnose without actually seeing the leaves, my best advice would be to collect a few affected leaves, seal them in a plastic bag and then take them to your local nursery or Cooperative Extension office for diagnosis. It may be nothing to worry about but you won't know until someone examines the leaves. Best wishes with your rose!
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