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. 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.

weed science

Fun Facts

Invasive weeds are spreading at a rate of about 4,600 acres per day on federal lands in the West.


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.

Click here for dicamba-related research results and presentations.

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