Eric Riley, former MU Weed Science Research Specialist, discusses the results of his research on the management of giant ragweed. Currently, herbicide-resistant waterhemp fields like this are one of the most problematic weeds in the state. An average waterhemp produces approximately 300,000 seed/plant. Note the size of waterhemp seed compared to a single corn kernel. Snow-on-the-Mountain (<em>Euphorbia marginata</em>) is one of the most poisonous weed species encountered in Missouri pastures.

weed science

Fun Facts


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.

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