This regulation establishes tolerances for residues of mancozeb in or on multiple commodities which are identified and discussed later in this document. The Interregional Research Project Number 4 (IR-4) requested these tolerances under the Federal Food, Drug, and Cosmetic Act (FFDCA). In addition, this action establishes a time-limited tolerance for residues of mancozeb in or on walnuts in response to the approval of a specific exemption under section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) authorizing the use of mancozeb on walnuts to control walnut blight. This regulation establishes a maximum permissible level of residues of mancozeb in walnuts. The time-limited tolerance on walnuts expires and is revoked on December 31, 2013. Also, this action revises the introductory text of paragraphs (a) and (b).