Spotted lanternfly close up (IMAGE) Penn State Caption Spotted lanternflies have piercing/sucking mouthparts that they use to suck the phloem sap out of plants. Credit Joe Keller Usage Restrictions Educational use only License Original 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.