Leaf Samples (IMAGE) University of California - Santa Cruz Caption UC Santa Cruz students helped to sample all the species at each study site for disease severity, gluing onto paper every leaf from five individual plants of each species at each site. The leaves were then scanned and the amount of diseased tissue on each species measured with image analysis software. Credit Gregory Gilbert Usage Restrictions For use only with news coverage of this research. 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.