Weed Science Volume 69 - Issue 4 - July 2021 (IMAGE) Cambridge University Press Caption Upright (left) and rosette (right) type horseweed plants emerging simultaneously in a field in Michigan during mid-summer. Credit Photo by John A. Schramski 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.