This regulation establishes tolerances for residues of dimethenamid in or on hop, dried cones; pumpkin, radish (roots and tops); rutabaga (roots and tops); turnip greens; turnip (roots and tops); and winter squash. The Interregional Research Project No. 4 (IR-4) requested these tolerances under the Federal Food, Drug, and Cosmetic Act (FFDCA). This regulation also modifies 40 CFR 180.464, section (b) by deleting the existing time-limited tolerance for winter squash as a permanent tolerance is being established by this action.