Fungus on Camellia tree

Asked June 20, 2019, 11:18 AM EDT

i have 4 Camellia trees, growing together, (each a different color) approximately 12 -15 ft. tall, trunks vary from 3-5 inches thick. There are several grey fungus pathces on many of the trunks, and branches. They are dry when scratched. Overwhelming majority of the leaves have correct color and shape. What is this fungus, and how do I treat?

Clackamas County Oregon lichen

1 Response

The white patches on the trunks and branches are not a disease.

Instead, they are lichen, a common indicator here in the northwest of good air quality. This particular kind is flat, almost as if painted on the trunk. Others are quite different, including folios (leafy) and filmy kinds. For a number of different kinds, see http://lichens.science.oregonstate.edu/lab/LICHENIMAGES.htm.