This regulation establishes an exemption from the requirement of a tolerance for residues of the biochemical, natamycin, in or on mushrooms when applied as a fungistat to prevent the germination of fungal spores on mushrooms produced in mushroom production facilities. DSM Food Specialties B.V. (DSM) submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting an exemption from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for such residues of natamycin.