Idaho Code § 22-904
Idaho Utility potatoes shall consist of potatoes of one (1) variety or similar varietal characteristics and shall be not less than one and one-half (1 1/2) inches in diameter and which are free from freezing injury, blackheart, and soft rot or wet breakdown, and from serious damage caused by dirt or other foreign matter, sunburn, second growth, growth cracks, air cracks, internal disorders, cuts, shriveling, scab, blight, dry rot, other disease, insects or mechanical or other means.
In order to allow for variations other than size incident to proper grading and handling, not more than six percent (6%) of the potatoes in any container may be below the requirement of the grade, but not to exceed one sixth (1/6) of this amount, or one percent (1%), shall be allowed for potatoes affected by soft rot or wet breakdown. In addition, not more than three percent (3%) may be below the prescribed minimum size and not more than five percent (5%) in addition may be seriously damaged by internal disorders.
Idaho Code § 22-904