1. Seed potatoes may be graded:
a.
(1) U.S. No. 1 seed potatoes;
(2) U.S. No. 2 seed potatoes; or (3) North Dakota Certified Seed; or b. As otherwise designated by the seed commissioner.
2. The U.S. grades must meet all of the requirements and standards established by the United States department of agriculture provided, however, that the seed commissioner may authorize an exception based on size.