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Maypop passionflower (<em>Passiflora incarnata</em>) is an increasing problem weed in a number of 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. MU Weed Scientists utilize GPS tracking collars to determine the effects of weed infestation on cattle grazing distribution.

weed science

Fun Facts

Herbicides substitute for the use of cultivation and laborers for hoeing weeds. To maintain current crop yields with laborers for weed removal, 69 million additional farm workers laboring for 11 billion hours would be required each summer in the U.S.


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: