In response to the increasing problem of herbicide resistance in weeds, several agricultural seed and chemical companies have introduced new varieties of corn, soybean and cotton that are tolerant to the synthetic auxin herbicides 2,4-D or dicamba. For example, the Enlist trait, from Corteva Agriscience, Agriculture division of DowDuPont, confers tolerance to 2,4-D in corn, cotton and soybean, while Bayer’s Xtend trait confers tolerance to dicamba in cotton and soybean. While these new tools may help with the management of herbicide-resistant weed species, they require proper stewardship. There are numerous ornamental, vegetable and crop species that are especially sensitive to even low doses of 2,4-D and dicamba; therefore, applicators must be vigilant when spraying these herbicides to prevent off-target movement.
This page provides access to training and resources from University of Missouri Extension weed scientists to support proper stewardship of synthetic auxin herbicides. MU Extension offers applicators the opportunity to complete the federally and state mandated training that is required to purchase and/or use Engenia, XtendiMax, or FeXapan. Applicators may complete the online course. Select “Online courses” to view a list of available options to complete the course online.
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News & articles
After harvest, review liability coverage
- Published: Monday, Oct. 22, 2018
COLUMBIA, Mo. – Post-harvest is a good time for producers to review their liability insurance coverage, says University of Missouri economist Ray Massey.Recent issues with dicamba spray drift highlight the need for farmers to understand their ...
MU food scientist studies soy rations for swine, poultry to add high-oleic fat
- Published: Wednesday, Aug. 8, 2018
COLUMBIA, Mo. – To make better bacon, feed a better soybean. Bryon Wiegand, University of Missouri food scientist, studies the use of Missouri’s high-oleic soybean oil in livestock rations. In a report at Soy Day, Wiegand joined MU faculty ...
Show Me Soy School set for July 31
- Published: Friday, July 20, 2018
COLUMBIA, Mo. – Researchers from University of Missouri Extension and the MU College of Agriculture, Food and Natural Resources share their work at the July 31 Show Me Soy School at Bay Farm Research Facility near Columbia. The Missouri Soybean ...
New MU app helps identify herbicide injury
- Published: Wednesday, July 18, 2018
COLUMBIA, Mo. – University of Missouri Extension introduced a new mobile app to identify herbicide injury at its annual Pest Management Field Day on July 10. MU Extension weed specialist Mandy Bish says Herbicide Injury ID lets users send photos ...
Managing 2,4-D and Dicamba in Enlist and Xtend Soybean
Publication date: June 1, 2017
Enlist and Xtend traits are engineered to provide resistance to the group 4 synthetic auxin herbicides 2,4-D and dicamba, respectively. These traits allow, for the first time, POST applications for control of broadleaf weeds in soybean and cotton. ...
Non-Certified Synthetic Auxin Applicator Training 2019
Open Enrollment begins January 2020. This self-paced, online course is intended for general audiences who wish to better understand proper application of synthetic auxin herbicides such as 2,4-D and Dicamba. This course is for informational purposes ...
Certified Synthetic Auxin Applicator Training 2019
Open Enrollment begins January 2020. Attention pesticide companies: If you need to enroll several employees in this course, your employees will have to register separately in their own name and using a unique email address. Separate registration is ...