Snow-on-the-Mountain (<em>Euphorbia marginata</em>) is one of the most poisonous weed species encountered in Missouri pastures. Spiny amaranth (<em>Amaranthus spinosus</em>) infesting a pasture in northwest Missouri. An average waterhemp produces approximately 300,000 seed/plant. Note the size of waterhemp seed compared to a single corn kernel. Currently, herbicide-resistant waterhemp fields like this are one of the most problematic weeds in the state.

weed science

Fun Facts


Weeds muscle out crops and other desirable plants by competing for water, nutrients, sunlight and space. One example: A mature saltcedar [tamarisk] plant consumes 300 gallons of water a day.


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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