Varroa mite on honey bee (IMAGE) Washington State University Caption Varroa mites seen living on a honey bee. Mites weaken bees' immune systems, transmit viruses, and siphon off nutrients. Credit Photo by Scott Bauer, USDA Agricultural Research Service. Usage Restrictions MUST credit USDA-ARS. This photo is taken from USDA-ARS image gallery. 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.