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 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.