Plantago (IMAGE) Washington University in St. Louis Caption A team led by biologist Rachel Penczykowski in Arts & Sciences at Washington University in St. Louis found more infestations of powdery mildew in St. Louis than in the city’s surrounding suburbs and countryside. Credit Rachel Penczykowski, Washington University in St. Louis Usage Restrictions For editorial purposes License Original 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.