This regulation establishes tolerances for residues of pymetrozine 1,2,4-triazin-3(2H)-one,4,5-dihydro-6-methyl-4-[(3- pyridinylmethylene) amino] in or on cotton seed, undelinted at 0.3 parts per million (ppm); cotton gin byproducts at 2.0 ppm; fruiting vegetables at 0.2 ppm; cucurbit vegetables at 0.1 ppm; leafy vegetables (except Brassica) at 0.6 ppm; head and stem Brassica vegetables at 0.5 ppm; leafy Brassica and turnip greens at 0.25 ppm; hops (dried) at 6.0 ppm; and pecans at 0.02 ppm. Syngenta Crop Protection requested these tolerances under the Federal Food, Drug, and Cosmetic Act, as amended by the Food Quality Protection Act of 1996.