Radioisotope Tracer Administration (IMAGE) University of Missouri-Columbia Caption In a series of tests, the team injected radioisotope tracers in healthy and rootworm-infested corn plants. Credit Richard Ferrieri 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.