7 CFR § 51.1541 - U.S. No. 1.
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§ 51.1541 U.S. No. 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; 2
2 Potatoes in containers bearing official State Seed Certification Tags and Seals are not required to be fairly clean but shall be free from damage by dirt.
(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.
[35 FR 18258, Dec. 1, 1970, as amended at 76 FR 31789, June 2, 2011]