Orange Leaf with Citrus Green Disease (IMAGE) Boyce Thompson Institute Caption A leaf from an orange tree with citrus greening disease shows the characteristic yellowing that is one symptom of the bacterial infection. Credit Sheryl Sinkow/Boyce Thompson Institute Usage Restrictions With credit to Sheryl Sinkow/Boyce Thompson Institute 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.