Oaks are Blaine's most plentiful and treasured neighborhood shade trees. Unfortunately, hundreds of oaks are lost every year to oak wilt, a vascular disease caused by the fungus Ceratocystis fagacearum.
Red Oaks are more susceptible to oak wilt and once infected can die within weeks. White oaks are not as susceptible and in some cases can take years before they die.
Root Graft Transmission
A transmission via root graft is the most common source of infection, as trees within as much as 15 meters (50 feet) of an infected tree can be infected.
Sap Beetle Transmission
The second method of infection is via sap beetles (also known as picnic beetles). These beetles are attracted to the bleeding sap of the oak tree, as well as the fungus in an infected or dead tree.