Azalea stems black

Asked May 18, 2020, 9:40 AM EDT

Last year I noticed a green fungus starting on outer stems of my azalea plants. Leaves and flowers were smaller than other branches without fungus. This year I noticed along with smaller leaves and flowers the stems have turned black. I don’t see any nymphs sucking along bark as I have on my holly bushes. Can these be saved? Can I treat with a horticultural oil like Neem?

Montgomery County Pennsylvania

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