Tar spot of corn (IMAGE) American Phytopathological Society Caption Tar spot symptoms (left panel) - Aerial view of infected tar spot field (top left). Close up of infected leaf (top right). Tar spot lesions (bottom left). Sporulating lesion (bottom right). Tar spot yearly spread from 2015 to 2021 (right panel). Credit Joshua S. MacCready et al. Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.