Fruit Flies (IMAGE) Michigan State University Caption Two hawthorn flies, Rhagoletis pomonella, mate on a hawthorn leaf. Credit James J. Smith, Michigan State University Usage Restrictions Use image only in association with this news release. 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.