AdvertisementBusted: EPA Discovers Dow Weedkiller Claim, Wants It Off The MarketNovember 25, 2015Dan CharlesfacebookEmailSoybeans are sprayed in Iowa in 2013. Enlist Duo is a mixture of two chemicals that farmers have used separately for many years: glyphosate (also known as Roundup) and 2,4-D. The new formulation is intended to work hand-in-hand with a new generation of corn and soybean seeds that are genetically engineered to tolerate sprays of both herbicides. (AP)