External Defects
| Defects | Maximum allowed for U.S. No. 1 processing | Maximum allowed for U.S. No. 2 processing |
|---|---|---|
| Air cracks | 5% waste | 10% waste. |
| Blackleg | 5% waste | 10% waste. |
| Bruises | 5% waste | 10% waste |
| Cuts | Smooth, not more than 10% of surface | Smooth, not more than 1⁄3 of surface. |
| Enlarged lenticels, discolored or sunken | 5% waste | 10% waste. |
| Flea Beetle | 5% waste | 10% waste |
| Folded end | 5% waste | 10% waste. |
| Fusarium tuber rot | 5% waste | 10% waste. |
| Grass, wireworm | 5% waste | 10% waste. |
| Greening, light | 5% waste | 10% waste. |
| Growth cracks | See Footnote No. 2 | 10% waste. |
| Grub | 5% waste | 10% waste. |
| Ingrown sprouts | 5% waste | 10% waste. |
| Nematodes | 5% waste | 10% waste. |
| Rhizoctonia, solid or thick mounded | Not more than 10% of surface | Not more than 25% of surface. |
| Rodent, bird damage | 5% waste | 10% waste. |
| Scab, pitted | 5% waste | 10% waste. |
| Scab, russet | 25% of surface or 5% waste | 50% of surface or 10% waste. |
| Scab, surface | 25% of surface or 5% waste | 50% of surface or 10% waste. |
| Scab, surface (elephant hide). | 10% of surface or 5% waste | 25% of surface or 10% waste. |
| Second growth | 5% waste | 10% waste. |
| Scaling, surface cracks - when cracked, thick and has depth | 10% of surface or 5% waste | 25% of surface or 10% waste. |
| Sunburn | 5% waste | 10% waste. |
| Sunken discolored areas | 5% waste | 10% waste. |
Internal Defects
| Defects | Maximum allowed for U.S. No. 1 processing | Maximum allowed for U.S. No. 2 processing |
|---|---|---|
| Occurring outside of or not entirely confined to the vascular ring | ||
| Internal Black Spot, Internal Discoloration, Vascular Browning, Fusarium Wilt, Net Necrosis, Other Necrosis, Stem End Browning | 5% waste | 10% waste. |
| Occurring entirely within the vascular ring | ||
| Hollow Heart or Hollow Heart with Discoloration | Area affected not to exceed that of a circle 7⁄8 inch in diameter in a 10 ounce potato.1 | Area affected not to exceed that of a circle 11⁄4 inches in diameter in a 10 ounce potato.1 |
| Light Brown Discoloration (Brown Center) | Area affected not to exceed that of a circle 7⁄8 inch in diameter in a 10 ounce potato.1 | Area affected not to exceed that of a circle 11⁄4 inches in diameter in a 10 ounce potato.1 |
| Internal Brown Spot and similar discoloration (Heat Necrosis) | Not more than the equivalent of 3 scattered spots 1⁄8 inch in diameter in a potato 6 ounces in weight or 21⁄2 inches in diameter, or correspondingly lesser or greater number of spots in smaller or larger potatoes | Not more than the equivalent of 6 scattered spots 1⁄8 inch in diameter in a potato 6 ounces in weight or 21⁄2 inches in diameter or correspondingly lesser or greater number of spots in smaller or larger potatoes. |