Q.Mossy Fungus and Spots Under Leaves
What can I use to treat mossy fungus on azaleas and spots under the leaves of camellias?

Certified GKH Gardening Expert
The fungus you see on the azalea is probably lichen. It is not harmful to the plant but if you want to be rid of it, this article will help:
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm
As for the spots on the camellias...Can you describe them a bit more, in terms of color and shape? There are several things it could be and I want to make sure we give you the right advice.