Algae, lichens and moss often form green or grey, powdery or mossy, crusty growths on the stems, branches and trunks of trees and shrubs. Pictured here, lichen and moss. This dreary "gray all day" ...

Understanding the Context

Q: There are greenish-gray patches all over the trees in our woods. I’ve heard people talk about lichen and moss killing trees and many of our trees do not look healthy. Do I need to be worried? - ...

Key Insights

San Antonio Express-News: Ball moss, lichen and mistletoe: Which ones will damage your trees in Texas and which are safe Ball moss, lichen and mistletoe: Which ones will damage your trees in Texas and which are safe Now that deciduous trees are bare, trunks and branches have taken center stage, and you might be noticing nuances and irregularities that evaded your attention over the summer. For instance, what are ... Oak wilt is a fungal disease that kills oak trees, spreading through the roots of the interconnected trees. We are about to enter the prime susceptibility time of year (Feb. 1 through June 30), so ...

Final Thoughts

Oregonian: Ask an expert: What is this white stuff on my dogwood tree and what do I do about it? Ask an expert: What is this white stuff on my dogwood tree and what do I do about it?