Greening-Resistant (IMAGE) University of Florida Caption This is an orange affected by the citrus greening bacterium, which causes citrus to become misshaped and retain its immature, green color. Credit UF/IFAS 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.