This regulation amends existing exemption from the requirement of a tolerance for residues of isophorone (CAS Reg. No. 78-59-1) to limit the use to beets, ginseng, rice, spinach, sugar beets, and Swiss chard. The Isophorone Task Group (ITG) requested this revised exemption from the requirement of a tolerance under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act (FQPA) of 1996. This regulatory action contributes toward the Agency's tolerance reassessment requirements under FFDCA section 408(q), as amended by the FQPA of 1996. By law, EPA is required by August 2006 to reassess the tolerances that were in existence on August 2, 1996. The regulatory action in this document pertains to the revision of one existing tolerance exemption which is counted as a tolerance reassessment toward the August 2006 review deadline.