my azalea has mildew like stains on the branches

Question

My azalea has mildew like stains on all the branches which are white in colour. What is it? How can I treat it?

Answer 1

Actually, I see that you listed this in houseplants. If your azalea is a houseplant, it might be powdery mildew. This will help with that, if you think this is the issue:
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm

Answer 2

This is lichen. It is not harmful to the plant at all. But if you would like to remove it, this article will help:
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm