psyllid nymphs (IMAGE) University of California - Riverside Caption Young Asian citrus psyllids, which transmit the bacteria that causes Huanglongbing. Credit Sam Droege/USGS Usage Restrictions No restrictions. License Public Domain 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.