7 CFR § 51.1450 - Serious damage.
Serious damage means any specific defect described in this section; or an equally objectionable variation of any one of these defects, or any other defect, or any combination of defects, which seriously detracts from the appearance or the edible or marketing quality of the individual portion of kernel or of the lot as a whole. The following defects shall be considered as serious damage:
(a) Any plainly visible mold;
(c) Decay affecting any portion of the kernel;
(d) Insects, web, or frass or any distinct evidence of insect feeding on the kernel;
(g) Dark kernel spots when more than three are on the kernel, or when any dark kernel spot or the aggregate of two or more spots affect an area of more than 10 percent of the surface of the half-kernel or piece;
(i) Undeveloped kernel. (See Figure 1.)