Infected Tuber (IMAGE) American Phytopathological Society Caption Fresh-cut symptomatic potato tuber received from APHIS showing classic zebra chip symptoms of darkened medullary rays and stripes in and near the vascular system. Credit K. D. Swisher Grimm and S. F. Garczynski 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.