Rhododendrons leave are covered in black sooty deposits, and the underside of leaf has white strips mainly down the spine of the leaf. The actual Rhodies are 50+ years old.
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wycani added on June 29, 2014 | Answered
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Answered on June 29, 2014
This article should provide you with some answers: https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-sooty-mold.htm
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