How long has Emerald Ash Borer Been here?
Case in point. This ash tree below showed no sign of EAB infestation as of July of last year. Forward five months to November and look what I discovered. See the off white markings on the left trunk? This is not normal for a healthy tree. What you see is evidence of woodpecker feeding activity. Woodpeckers are smart and can hear the borers chewing beneath the bark. If you see these markings that is a tell tale sign that you have an infested tree.