Department of Plant and Soil Sciences: Weed Science

Dr. Misha Manuchehri
Weed Science Extension Specialist
Oklahoma State University
Department of Plant and Soil Sciences
371 Ag Hall
Stillwater, OK 74078
Office: 279 Ag Hall
Phone: (405)-744-9588

Todd Baughman
IAB Weed Science Program Support Leader
3210 Sam Noble Parkway
Ardmore, Oklahoma
Phone: (580)224-0620



Department of Plant and Soil Sciences: Weed Science

Oklahoma State University Weed Science

2019 Slide Deck for Required Oklahoma Dicamba Training

2019 Dicamba Rules Update

This slide set covers the information that is presented during Oklahoma Dicamba Trainings. A formal training session is required for all applicators who plan to apply XtendiMax, FeXapan, and/or Engenia. This slide deck is not a substitute for the required training but does contain the information covered in the training.


Welcome to the Weed Science extension web site for the Department of Plant and Soil Sciences at Oklahoma State University.  The purpose of this site is to provide current information regarding extension and research activities in weed management for all of Oklahoma’s crop production systems, resources for weed identification, and contact information for the weed science personnel at OSU.  For the quickest updates regarding weed management issues in Oklahoma, please check the Plant and Soil Sciences Extension News site or follow OSU Weed Science on Twitter.

Follow @OSUWeedScience



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Diagnostic service to test for herbicide-resistant weeds

Herbicide-resistant weeds is one of the many issues that producers are now facing throughout Oklahoma and the United States.  Early detection of populations of herbicide-resistant weeds will give a head-start to management and prevention of their spread.  At OSU, we have started a new diagnostic service program that allows for producers, crop consultants, and extension educators to submit weed samples for testing to determine if the weeds are resistant to certain herbicides.  This program is funded in part by the Oklahoma Peanut Commission, the Oklahoma Soybean Board, and the Oklahoma Wheat Commission and will be provided as a free service to anyone involved in Oklahoma agricultural production.

The fact sheet,  PSS-2779 “Diagnostic Service to Test for Herbicide-resistant Weeds in Oklahoma,” gives instructions for collecting and submitting seed samples.  The seed samples do not need to be threshed and cleaned, but it is important to collect enough seed for adequate testing (typically, enough to fill half of a paper lunch sack).

If you have any questions, please contact your county OCES agricultural educator or Misha Manuchehri, OSU Extension Weeds Specialist, at (405) 744-9588 for more information.

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