Common ragweed plants typically release a billion pollen grains per plant from August through October, triggering allergic reactions for nearly 36 million Americans annually.
Welcome to the University of Missouri's Weed Science homepage. Here you can find information related to our extension, research, and teaching programs or visit some of our web resources like the Missouri Weed Identification or Herbicide Injury Guides. In our "Research Results" section, you can search results from our field research by year, herbicide, weed, or crop. Additionally, you can click on our publication section to see all of the publications and newsletter articles we provide as well as to view and/or listen to some of our power point presentations. We welcome your comments and/or suggestions about this site.
Download our new Weed ID App at the Apple App or Google Play Stores for I-phones, I-pads, and Android devices: