This regulation increases the tolerances for residues of azoxystrobin (methyl) (E)-2-(2-(6-(2-cyanophenoxy)pyrimidin-4- yloxy)phenyl)-3-methoxyacrylate) and its Z isomer (methyl(Z)-2-(2-(6- (2-cyanophenoxy)pyrimidin-4-yloxy)phenyl)-3-methoxyacrylate) in or on pistachios from 0.01 part per million (ppm) to 0.02 ppm and in or on tree nuts from 0.01 ppm to 0.02 ppm. A final rule establishing tolerances of azoxystrobin and its Z isomer in or on pistachios at 0.01 ppm and in or on tree nuts at 0.01 ppm was published in the Federal Register of March 17, 1999. These were the tolerances that Zeneca Ag Products had originally proposed in pesticide petition number 7F4864. Immediately following publication of this final rule, EPA received telephone comments from two parties indicating that they believed that the pistachio and tree nuts tolerances were too low, considering the data submitted in support of the tolerances and the use directions on the label, and might lead to adulterated commodities even when the label use directions were accurately followed. EPA agreed to revisit the tolerances assigned to these commodities, concluded that the commenters were correct in their concerns, and published a proposed rule in the Federal Register of January 5, 2000, that made the proposal to increase the tolerances for azoxystrobin and its Z isomer in or on pistachios and in or on tree nuts to 0.02 ppm. No comments concerning the proposed rule were received.