Sick Rhododendron. Some of the most common dangers to your rhododendron include aphids root rot and japanese beetles. Unfortunately the lovely plant is prone to disease and pests.
Lift plant and improve soil structure or move to better drained spot. If the same symptom appears in new leaves then it is likely that. Rhododendrons are fibrous shallow rooted plants that need good drainage to perform well.
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My neighbour is upset that her very old rhodoendron flower appears to be dying. Any clue as to what might be the problem. This is a general sign of unhappiness and can have many causes. There are several factors that could result in a rhododendron looking like it is dying.