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Weed Science Extension

A crop field with weeds.

Weed management resources

Our slideshows and videos address an array of weed management issues, such as herbicide resistance, pasture weed management, and off-target herbicide movement.

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A field infested with henbit.

What weeds are these?

Our Weed ID Guide will help you identify weeds in your crops, gardens, lawns, pastures and even ponds.

Identify your weeds

The Weed Science program at the University of Missouri administers extension, research and teaching programs to keep you informed of the latest findings in weed management.

Our online resources include a Missouri weed ID guide and a herbicide injury guide. Both of these guides are full of photos — to aid in the identification of a weed or the diagnosis of herbicide-caused crop injury, respectively. They are also available as mobile apps. In addition, we offer numerous publications, newsletter articles, videos and PowerPoint presentations on various aspects of weed control.

Publications

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Weed Identification and Herbicide Injury Guide for Corn and Soybean

Publication date: Nov. 1, 2018

$30.00

Check out our ID Weeds app to help identify weeds,Apple App for iPhones, iPads.Google Play Store for Android devices.Mandy BishDivision of Plant SciencesIn corn and soybean cropping systems throughout the Midwest, weeds represent an economically ...

Missouri Weed Seeds

Publication date: Nov. 1, 2018

Positive identification of pests, including weeds, is the first step in a sound integrated pest management program. Knowledge of plant morphological features, such as leaf and stem shape, flower type and color, and the presence of hairs make ...

Kochia Management in Soybeans

Publication date: March 1, 2018

Kochia is well adapted to the Great Plains and western regions of the U.S. and Canada. It can emerge as early as February in Kansas and March in the northern Great Plains, but germination can extend through August throughout the Great Plains states. ...

Velvetleaf Management in Soybeans

Publication date: March 1, 2018

Velvetleaf — also known as elephant ear, buttonweed and butterprint — is a common weed species found in most fields throughout the soybean belt. It can be extremely competitive with soybeans and reduce yields by 25 to 40 percent. This fact sheet ...

Palmer Amaranth Management in Soybean

Publication date: Jan. 1, 2018

Native to the southwestern United States, Palmer amaranth (aka Palmer pigweed) has become a devastating weed problem in the South and has recently spread to the Upper Midwest. This fact sheet provides guidance on how to manage this difficult weed in ...

Herbicide-Resistant Horseweed (Marestail) Management in No-Till Soybean

Publication date: Jan. 1, 2018

Horseweed (marestail), which has two primary periods of emergence, competes with soybeans throughout the growing season and reduces crop yield. This fact sheet lists steps for managing horseweed in your soybean fields.

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Resources

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2014 Field Day: Comparing Palmer Amaranth to Common Waterhemp (video)

MU Extension State Specialist Kevin Bradley shares characteristics that can help distinguish between waterhemp and Palmer amaranth at the 2014 Mizzou Pest Management Field Day.

The Cattle Vote (video)

MU Extension State Specialist Kevin Bradley addresses the question of whether treating pastures for weeds is advantageous. Cattle grazing preferences were monitored with GPS-tracking collars. The preference for herbicide-treated pastures was clear.

Weed Management in Pastures (PDF)

What factors should you consider when it comes to pasture weed control? This presentation summarizes common Missouri pasture weeds, factors to consider before applying herbicides, and identification tips on weeds that pose health risk to livestock.

2013 Field Day: Horseweed Stop (video)

MU Extension State Specialist Kevin Bradley discusses the importance of controlling marestail, or horseweed, prior to soybean planting at the 2013 Mizzou Pest Management Field Day.

2014 Field Day: Dicamba and 2,4-D Drift Injury on Soybean (video)

University of Missouri Extension State Specialist Kevin Bradley describes how little dicamba and 2,4-D are required to injury sensitive soybean at the 2014 Mizzou Pest Management Field Day.

2015 Field Day: Control of Marestail/Horseweed (video)

MU Extension State Specialist Kevin Bradley presents burndown programs for difficult to control marestail, or horseweed, at the 2015 Mizzou Pest Management Field Day.

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