dead ash tree (IMAGE) Penn State Caption This dead ash tree shows the fatal damage inflicted by the emerald ash borer. More than 90% of infested trees die, likely resulting in ash species becoming functionally extinct in North America. Credit Penn State Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.