A deadly new oak-tree disease can be prevented by pruning them in the dormant season (if needed) instead of spring or summer.

I don't know what this is on my oak tree, but is it anything I should be concerned about? Should I spray with something?

Purdue Landscape Report: Inonotus dryadeus is one of the more common wood decay fungi we receive at the diagnostic lab in association with declining trees, specifically oaks. Inonotus is found so ...

Oak wilt is caused by the fungus Bretziella fagacearum. Once a tree is infected, the fungus may fruit, creating gray to black ...

Often trees with decaying wood in their trunks are beginning to lose strength. They can come tumbling down without warning.