This regulation establishes a time-limited tolerance for combined residues of bifenazate (1-methylethyl 2-(4-methoxy[1,1'- biphenyl]-3-yl)hydrazinecarboxylate) and diazinecarboxylic acid, 2-(4- methoxy-[1,1'-biphenyl]-3-yl), 1-methylethyl ester (expressed as bifenazate) in or on potatoes. This action is in response to use of this chemical on potatoes under an emergency exemption under section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). This regulation establishes a maximum permissible level for residues of bifenazate in this food commodity. The tolerance will expire and is revoked on December 31, 2006.