Internal defects are defects which cannot be detected without cutting the potato. Some internal defects are listed in Table VII.
Table VII-Internal Defects
Defects | Damage Maximum Allowed | Serious Damage Maximum Allowed |
Occurring outside of or not entirely confined to the vascular ring | ||
Ingrown Sprouts, Internal Discoloration, Vascular Browning, Fusarium Wilt, Net Necrosis, Other Necrosis, Stem End Browning | 5 percent waste | 10 percent waste. |
Internal Black Spot | When the spot(s) are darker than the official color chip (POT-CC-2) after removing 5 percent of the total weight of the potato | When the spot(s) are darker than the official color chip (POT-CC-2) after removing 10 percent of the total weight of the potato. |
Occurring entirely within the vascular ring | ||
Hollow Heart or Hollow Heart with Discoloration | Area affected not to exceed that of a circle 1/2 inch in diameter in a potato 21/2-inches in diameter or 6 ounces in weight.1 | Area affected not to exceed that of a circle 3/4 inch in diameter in a potato 21/2-inches in diameter or 6 ounces in weight.1 |
Light Brown Discoloration (Brown Center) | Area affected not to exceed that of a circle 1/2 inch in diameter in a potato 21/2 inches in diameter or 6 ounces in weight.1 | Area affected not to exceed that of a circle 3/4 inch in diameter in a potato 21/2 inches in diameter or 6 ounces in weight.1 |
Occurring entirely within the vascular ring | ||
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 21/2-inches in diameter or 6 ounces in weight.1 | Not more than the equivalent of 6 scattered spots 1/8 inch in diameter in a potato 21/2-inches in diameter or 6 ounces in weight.1 |
1Note: Correspondingly lesser or greater areas in smaller or larger potatoes.
7 C.F.R. §51.1565