Ash tree leaves in the sun (IMAGE) Penn State Caption To develop breeding programs that will produce climate-resilient, emerald ash borer-resistant trees, it will be necessary to prioritize conservation of range-wide genomic diversity, according to the researchers. 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.