Adults on silver maple (IMAGE) Penn State Caption New long-term research led by Penn State has discovered that hardwood trees, such as maple, willow and birch, may be less vulnerable to spotted lanternflies than initially thought. Credit Joe Keller Usage Restrictions Educational use only License Original content 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.