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In the Tri-State we see a lot of the oak wilt fungus, Ceratocystis fagacearum, it enters an oak either through a root graft or a fresh wound. We have learned that once inside the tree, the fungus grows in the water carrying vessels of the tree and spreads throughout the roots, trunk, and branches. We know that as a mode of defense, the tree attempts to stop the spreading fungus by using gummy substances, called tyloses. These tyloses clog the water vessels within the tree, but do not stop the fungus. The lack of water flow causes leaves to wilt rapidly and fall to the ground. The oak essentially shuts off the water supply and dies from drought