This regulation establishes a temporary exemption from the requirement of a tolerance for residues of the biochemical pesticide S- Abscisic Acid, (S)-5-(1-hydroxy-2,6,6-trimethyl-4-oxo-1-cyclohex-2- enyl)-3-methyl-penta-(2Z,4E)-dienoic Acid in or on grapes when applied or used as a plant regulator in accordance with the terms of Experimental Use Permit 73049-EUP-4. Valent Biosciences Corporation submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act of 1996 (FQPA), requesting the temporary tolerance exemption. This regulation eliminates the need to establish a maximum permissible level for residues of S-Abscisic Acid, (S)-5-(1-hydroxy-2,6,6-trimethyl-4-oxo-1- cyclohex-2-enyl)-3-methyl-penta-(2Z,4E)-dienoic Acid. The temporary tolerance exemption expires on October 1, 2010.