Thermal Image (IMAGE) Swansea University Caption Increasing severity of Xylella fastidiosa symptoms in olive tree crowns in colors from green to red detected by thermal images. Credit CREDIT Alberto Hornero - Swansea University Usage Restrictions None 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.