(a) Bruises which affect the flesh more than three-sixteenths of an inch in depth or more than an aggregate surface area of one-half of an inch in diameter.

(b) Growth cracks over one-half of an inch in length or over three-sixteenths of an inch in depth, except that healed growth cracks within the stem end cavity are not serious damage unless they are over five-eights of an inch in length or over three-sixteenths of an inch in depth.

(c) Sunburn which affects the flesh.

(d) Hail which results in one or more depressions over three-sixteenths of an inch in depth or which affects more than an aggregate surface area of one-half of an inch in diameter.

(e) Doubles, if one portion is one-fourth or less in size than the other portion of the plum or fresh prune.

(f) Thrip marks or other similar insect injury if 15 percent or more of the surface of the plum or fresh prune is affected or which causes one or more depressions or raised portions (bumps or welts) one-fourth of an inch or more in depth or height.

(g) Internal growth cracks, cavities, or gum spots if they cause the plum to be seriously malformed.