Sugar Beet Leaf (IMAGE) Earlham Institute Caption This is a sugar beet leaf showing symptoms of powdery mildew (left) -- grey-white mycelium and (right) -- rust (Uromyces betae) -- orange/brown pustules. Credit BBRO 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.