This regulation establishes tolerances for residues of ethalfluralin in or on rapeseed subgroup 20A and sunflower subgroup 20B. This regulation additionally removes the established tolerances in or on mustard, seed; rapeseed, seed; safflower, seed; and sunflower, seed, as they will be superseded by the tolerances established by this final rule. Interregional Research Project Number 4 (IR-4) requested these tolerances under the Federal Food, Drug, and Cosmetic Act (FFDCA).