Grades of Potatoes
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U.S. No. 1 consists of potatoes which meet the following requirements:
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Similar varietal characteristics, except when designated as a mixed or specialty pack;
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Firm;
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Fairly clean;
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Fairly well shaped;
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Free from:
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Freezing;
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Blackheart;
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Late blight, southern bacterial wilt and ring rot; and,
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Soft rot and wet breakdown.
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Free from damage by any other cause. See §§51.1564 and 51.1565.
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Size. Not less than 1-7/8 inches in diameter, unless otherwise specified in connection with the grade.
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For tolerances see §51.1546.
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U.S. Commercial consists of potatoes which meet the requirements of U.S. No. 1 grade except for the following:
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Free from serious damage caused by:
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Dirt or other foreign matter;
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Russet scab; and,
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Rhizoctonia.
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Increased tolerances for defects specified in §51.1546.
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U.S. No. 2 consists of potatoes which meet the following requirements:
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Similar varietal characteristics, except when designated as a mixed or specialty pack;
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Not seriously misshapen;
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Free from:
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Freezing;
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Blackheart;
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Late blight, southern bacterial wilt and ring rot; and,
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Soft rot and wet breakdown.
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Free from serious damage by any other cause. See §§51.1564 and 51.1565.
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Size. Not less than 1-1/2 inches in diameter, unless otherwise specified in connection with the grade.
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For tolerances see §51.1546.
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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