Q.Identify Azalea Disease
I have noted a light bluish-green, algae-type deposit on the branches of my very mature azaleas in southern New Jersey. I planted these over 30 years ago and do not want to lose these specimens.

Nikki
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on March 9, 2011
It actually sounds like they have developed a lichen, which is not harmful to the plants. This article will explain more about them:
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm
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