Tar spot examination (IMAGE) Purdue University Caption Mariela Fernández-Campos, a graduate student in Purdue University’s Department of Botany and Plant Pathology, examines leaves for tar spot in a field at Pinney Purdue Agricultural Center. Credit Credit Purdue Agricultural Communications/Joshua Clark Usage Restrictions News organizations may use this image in reports about Purdue University’s C.D. Cruz and his collaborators. 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.