Oak wilt is an aggressive disease that affects many species of oak (Quercus spp.) It is a very serious tree disease in the eastern United States, killing thousands of oaks each year in forests, woodlots, and home landscapes.
Symptoms of oak wilt in
A. white oak and
B. red oak.
Oak wilt was confirmed for the first time in New York State, September 2008, in Glenville, Schenectady County. In 2009, 73 infested or likely to become infested trees were destroyed.
Additional infected trees were found in September, 2013. View the November 2013 Emergency Order (PDF, 217 KB) outlining the protective zone for this infestation.
Oak wilt is caused by a fungus, Ceratocystis fagacearum. The fungus grows in the water-conducting vessels of host trees and as it does, it causes the vessels to produce gummy plugs that prevent water transport. As water movement within the tree is slowed, the leaves wilt and drop off, and eventually the tree dies.
Oak wilt is known to attack all species of oak but kills red oaks quickly; it has been known to kill trees within a few weeks following infection. White oaks on the other hand may survive many years following infection.
For more information about oak wilt, its identification and management recommendations, please see the links in the right column of this web page.