Hemlock Woolly Adelgid Infestation (IMAGE) USDA Forest Service ‑ Southern Research Station Caption Hemlock woolly adelgids attach at the base of the needles. Credit Chris Evans, River to River CWMA, Bugwood.org Usage Restrictions Work cannot be used for commercial purposes without permission from the photographer or copyright owner. License Licensed 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.