This regulation amends an existing temporary exemption from the requirement of a tolerance for residues of the atoxigenic microbial pesticide, Aspergillus flavus AF36 on cotton consistent with the Experimental Use Permit 69224-EUP-1, which will now allow for application to cotton in certain counties in Arizona and Texas. Interregional Research Project Number 4 (IR-4), on behalf of the USDA/ ARS Southern Regional Research Center, submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act (FQPA) of 1996, requesting the temporary tolerance exemption amendment. This regulation eliminates the need to establish a maximum permissible level for residues of Aspergillus flavus AF36. The temporary tolerance exemption will expire on December 30, 2004.