Lichens and Trees
I have a yellow lichen on the bark of my walnut trees and
want to know if it is killing my tree?It seems to be spreading all over
the branches and trunk?
Lichens growning on the surface of bark do not harm trees. Lichens are unique partenerships of
an algae and a fungus. They grow on many different surfaces, including bare rock. This web
site is an introduction:
No, lichens rarely are agents of death of trees. Most likely, there are
other problems contributing to the decline of your trees. The following
should be helpful:
Anthony Brach Ph.D.
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Update: June 2012