Potatoes Grades and Standards

Grades of Potatoes

  1. U.S. No. 1 consists of potatoes which meet the following requirements:

a. Similar varietal characteristics, except when designated as a mixed or specialty pack;
b. Firm;
c. Fairly clean;
d. Fairly well shaped;
e. Free from:
1. Freezing;
2. Blackheart;
3. Late blight, southern bacterial wilt and ring rot; and,
4. Soft rot and wet breakdown.
f. Free from damage by any other cause. See §§51.1564 and 51.1565.
g. Size. Not less than 1-7/8 inches in diameter, unless otherwise specified in connection with the grade.
h. For tolerances see §51.1546.
  1. 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.
  1. U.S. No. 2 consists of potatoes which meet the following requirements:

a. Similar varietal characteristics, except when designated as a mixed or specialty pack;
b. Not seriously misshapen;
c. Free from:
1. Freezing;
2. Blackheart;
3. Late blight, southern bacterial wilt and ring rot; and,
4. Soft rot and wet breakdown.
d. Free from serious damage by any other cause. See §§51.1564 and 51.1565.
e. Size. Not less than 1-1/2 inches in diameter, unless otherwise specified in connection with the grade.
f. For tolerances see §51.1546.

Visual Aids

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Detailed standards, Inspection Instructions & Other Resources: