Varroa before metarhizium (IMAGE) Washington State University Caption Varroa destructor mites in a petri dish before being exposed to the new strain of metarhizium fungi. Credit Washington State University Usage Restrictions With credit 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.