Effect of Root Rot (IMAGE) University of California - Riverside Caption This photo shows a dying Hass avocado scion on a rootstock that is not tolerant to root rot. Credit Douhan lab, UC Riverside Usage Restrictions None 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.