``U.S. Fancy'' consists of nectarines of one variety which are mature but not soft or overripe, which are well formed, clean, and free from decay, broken skins which are not healed, worms, worm holes, and free from injury caused by bruises, growth cracks, hail, sunburn, sprayburn, scab, bacterial spot, scale, split pit, scars, russeting, other disease, insects, or mechanical or other means.
(a) Each nectarine shall have not less than one-third of its surface showing red color characteristic of the variety. (See Sec. 51.3150.)
(b) [Reserved]