Answer: Good be a few things but it really sounds like an iron deficiency (had the same problem with mine recently). A major sign of this is chlorosis (yellowing of the leaves), and azaleas have a pretty big demand for iron. They may have, over the years, depleted the soil of it's iron, or, for some reason, they are no longer to absorb it from the soil (pH too high, too low, etc.). In any event, I would recommend you have your soil tested. Contact your County Extension Service for details on having a test performed. You can find the phone number in the blue pages of your phone book (I would have looked it up for you but you didn't list your county). Let your agent know what sort of problems you are having, and that you suspect an iron deficiency. When the results come back the agent can let you know if that is the problem (and if not what is) and can offer you solutions. Good Luck!
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