MPMI Cover (IMAGE) American Phytopathological Society Caption A leaf from the Arabidopsis pad4-13 mutant infected with powdery mildew (Golovinomyces cichoracearum) and stained with trypan blue 8 days postinfection. Credit Irene Serrano 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.