Enlist corn, which confers resistance to both 2,4-D and aryloxyfenoxypropionate (the “fop” grass herbicides), will be available for the 2018 growing season, according to the Dow Chemical Company. For use on Enlist corn, Dow AgroSciences has developed a new formulation of 2,4-D, which is a 2,4-D choline salt. This formulation is lower in volatility than 2,4-D amine or ester. Trade name “Enlist Duo” is a premix of 2,4-D choline plus glyphosate, using proprietary Colex-D technology by Dow AgroSciences. Enlist Duo has been approved for application to Enlist corn and preplant burndown treatment on conventional corn.
Enlist corn traits were actually deregulated by the U.S. Department of Agriculture in 2016. However, certain export markets had not been approved at that time, so commercial availability of Enlist corn was put on hold until those key markets were approved. The Ministry of Agriculture of the People’s Republic of China has now approved the import of grain produced from corn containing the Enlist trait, according to a June 14, 2017 news release from Dow AgroSciences.
Enlist corn will be widely available in the U.S. and Canada, and will be sold as both SmartStax Enlist and PowerCore Enlist hybrids, the according to Dow AgroSciences news release. The Enlist technology will also be licensed to other seed companies.
Using Enlist Duo on Enlist corn will allow producers to help manage glyphosate-resistant pigweeds and many other broadleaf weeds, including velvetleaf and morningglory.
K-State research has generally found that Enlist corn has excellent tolerance to Enlist Duo. Enlist Duo will be most effective when weeds are small and should be used in conjunction with preemergence corn herbicide programs. Enlist Duo will not be effective on glyphosate-resistant kochia without an addition of a dicamba-type product or other herbicides that are more effective on kochia than 2,4-D.
Curtis Thompson, Extension Agronomy State Leader and Weed Management Specialist