The Emerald Ash Borer (EAB), Agrilus planipennis, is quickly developing into the most significant forest pest to hit New York since the Chestnut blight. EAB has been spreading in New York and it is important for anyone with ash trees to be aware of recent developments in order to formulate effective management decisions. Although first detected in New York in 2009, EAB has been established in most locations much longer than that and now populations are building to the point that they are beginning to spread across the landscape at an increasing rate.