University of Missouri Extension has a free program to identify oak tree diseases affecting trees across Missouri. See how to submit samples.

Q: The leaves on my newly planted oak tree have numerous holes, and the edges of the leaf are missing. I do not see any insects, but I am worried about the tree. Most of the tree is like this. A: Oaks ...

Learn how to identify trees—in one week National Geographic's Wonder Lessons will teach you how to navigate the stars, spot cloud types, recognize common trees, and identify different kinds of rocks.

Texas forest officials are trying to stop residents from pruning their trees in the new year to guard against a deadly tree disease known as oak wilt. Winter is typically the best time to trim trees, ...