Grades of Potatoes
- U.S. No. 1 consists of potatoes which meet the following requirements:
- Similar varietal characteristics, except when designated as a mixed or specialty pack;
- Firm;
- Fairly clean;
- Fairly well shaped;
- Free from:
- Freezing;
- Blackheart;
- Late blight, southern bacterial wilt and ring rot; and,
- Soft rot and wet breakdown.
- Free from damage by any other cause. See §§51.1564 and 51.1565.
- Size. Not less than 1-7/8 inches in diameter, unless otherwise specified in connection with the grade.
- For tolerances see §51.1546.
- U.S. Commercial consists of potatoes which meet the requirements of U.S. No. 1 grade except for the following:
- Free from serious damage caused by:
- Dirt or other foreign matter;
- Russet scab; and,
- Rhizoctonia.
- Increased tolerances for defects specified in §51.1546.
- Free from serious damage caused by:
- U.S. No. 2 consists of potatoes which meet the following requirements:
- Similar varietal characteristics, except when designated as a mixed or specialty pack;
- Not seriously misshapen;
- Free from:
- Freezing;
- Blackheart;
- Late blight, southern bacterial wilt and ring rot; and,
- Soft rot and wet breakdown.
- Free from serious damage by any other cause. See §§51.1564 and 51.1565.
- Size. Not less than 1-1/2 inches in diameter, unless otherwise specified in connection with the grade.
- For tolerances see §51.1546.
Visual Aids
- Unofficial Potato Visual Aid (pdf) - Large file may load slowly
Official Visual Aids are available for Purchase. See How to Purchase Visual Aids for more details.
Detailed standards, Inspection Instructions & Other Resources:
- U.S. Grade Standards for Potatoes (pdf)
- U.S. Consumer Standards for Potatoes (pdf)
- 7 CFR 945 Irish Potatoes Grown In Certain Designated Counties in Idaho, and Malheur County, Oregon
- 7 CFR 948 Irish Potatoes Grown In Colorado
- 7 CFR 948 Irish Potatoes Grown In Southeastern States
- Importing Irish Potatoes
- Shipping Point and Market Inspection Instructions for Potatoes (pdf)
- Termination of Marketing Order for Irish Potatoes Grown in Washington State