Calvin Price State Forest

Danielle Martin, U.S. Forest Service, Coopers Rock State Forest, oak trees, oak
Jesse Wright / West Virginia Public Broadcasting

Last fall, Danielle Martin, a forest pathologist for the U.S. Forest Service in Morgantown, and her colleagues noticed something different about the oak trees in Seneca State Forest. The trees secreted an amber-colored sap, and bore cankers - which look like canker sores - underneath their bark.