Controlling challenging weeds in South Dakota soybeans with new herbicides
Sustainable Production
AgricultureCrop protectionHerbicide
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Michael Moechnig, South Dakota State University
Co-Principal Investigators:
Jill Alms, South Dakota State University
Darrell Deneke, South Dakota State University
Rutendo Nyamusamba, South Dakota State University
David Vos, South Dakota State University
+3 More
Project Code:
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

Optimizing soybean yields will partially depend on successfully managing challenging weeds species and quickly adapting to glyphosate resistant biotypes to prevent yield loss and seed bank accumulations. Information is needed to determine whether these new technologies are economical and if so, how they may best benefit the soybean grower. Working with industry, the research group will evaluate new soybean varieties and herbicide programs and will provide unbiased evaluations of these programs compared to conventional weed control programs.

Unique Keywords:
#dicamba-resistance, #glyphosate studies, #libertylink? soybeans, #soybean production management, #weed control, #weed control-herbicide resistance
Information And Results
Project Deliverables

Final Project Results

Progress regarding weed management extension and field research activities have progressed as planned since last quarterly report. Field research plots were completed and analyzed. Field projects included the soybean herbicide demonstration plots at Volga, NE Station, and the SE Station. Research projects included new herbicide evaluation studies, timing of dicamba or 2,4-D drift on soybeans, dandelion control in no-till, scouring rush control, kochia seed bank management, and volunteer soybean competition and control in corn. Results from these studies were printed in our research results publication that has been distributed to producers, industry representatives, and pesticide applicators. Approximately 500 copies have been distributed at this time. Research results were also posted on our searchable database at http://www.sdstate.edu/ps/weed-mgmt/weed-mgmt-crops.cfm.

We have been screening weeds for glyphosate resistant biotypes in the greenhouse. Our biennial wormwood sample sent in from the Conde area was not glyphosate resistant. That is a relief as that weed could be very difficult to control in Roundup Ready soybeans if it was glyphosate resistant. One kochia sample was confirmed as resistant, which adds to our list of confirmed resistant biotypes.

However, kochia escapes were common in central SD this year indicating that glyphosate resistance may have expanded greatly. We still have samples of lambsquarters and waterhemp currently being screened, results are being evaluated with one of the waterhemp samples looking like it is glyphosate resistant and the lambsquarters sample looking like it is not resistant to glyphosate treatments. We will continue to screen weeds from suspect fields as requested.The soybean herbicide fact sheet has been updated and approximately 3,000 copies printed. This year, we combined the herbicide, insecticide, and fungicide information to create a more comprehensive guide for pest management in soybeans. Over 2000 copies have been distributed to farmers and industry representatives at meetings, training events, and as requested. Of these over 1600 were handed out at the Commercial Pesticide Applicator Certification meetings in January and February 2013.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.