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Infected trees wilt and usually drop their leaves during the summer. The red oak group, being most susceptible usually drops their leaves the same year as they are infected. Conversely, trees in the white oak group may be infected for 1 to 3 years before showing any symptoms. Photo courtesy of Robert Blanchette. 
Vascular discoloration of the inner sapwood caused by an accumulation of tree defense compounds.
Photo courtesy of Robert Blanchette.
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