Lumax, a corn herbicide containing atrazine, mesotrione, and S-metolachlor, was tested for weed control efficacy in grain sorghum in Kansas in 2006. Control of Palmer amaranth resistant to triazine and ALS-inhibitor herbicides, ranged from good to excellent, compared with labeled sorghum herbicides. The application for a section 18 emergency exemption allowing Lumax use in grain sorghum, was approved for KS by the Environmental Protection Agency in both 2006 and 2007. Previous field trials had determined that Lumax at the 2.77 kg ai/ha rate, was adequately tolerated by grain sorghum when applied to medium- or fine-textured soils from one to two weeks before planting.