CFR › Title 7 › Part 51 › §51.15427 CFR §51.1542Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link“U.S. Commercial” consists of potatoes which meet the requirements of U.S. No. 1 grade except for the following:(a)Free from serious damage caused by:(1)Dirt or other foreign matter;(2)Russet scab; and,(3)Rhizoctonia.(b)Increased tolerances for defects specified in § 51.1546.