134 MISC. PUB. 190, U.S. DEPT. OF AGRICULTURE 
“TOLERANCE FOR DEFECTS 
In order to allow for variations other than size 
incident to proper grading and handling, not more 
than 6 percent of the potatoes in any container may be 
below the requirements of the grade but not to 
exceed one sixth of this amount or 1 percent shall be 
allowed for potatoes affected by soft rot or wet 
breakdown. In addition, not more than 5 percent 
may be damaged by hollow heart. 
U.S. Commercial shall consist of potatoes which 
meet the requirements of U.S. No. 1 grade except 
that they shall be free from serious damage by dirt 
(5a) and except for the increased tolerance for 
defects specified below. 
Unless otherwise specified the diameter (4) of each 
potato shall be not less than 1% inches. (See Size 
Classification, pp. 185 and 136, and Tolerance for Size, 
pp. 186 and 137.) 
TOLERANCE FOR DEFECTS 
In order to allow for variations other than size 
incident to proper grading and handling, not more 
than a total of 20 percent of the potatoes in any 
container may be below the requirements of this 
grade, but not more than 5 percent may be seriously 
damaged by hollow heart and not over 6 percent may 
be below the remaining requirements of U.S. No. 2 
grade, provided that not more than one sixth of this 
amount or 1 percent shall be allowed for potatoes 
affected by soft rot or Wet break-down. 
U.S. No. 2 shall consist of potatoes of similar varie- 
tal characteristics which are free from freezing injury, 
blackheart, and soft rot or wet break-down (2) and 
from serious damage (5) caused by dirt (5a) or other 
foreign matter, Sunburn, second growth, growth cracks, 
air cracks, hollow heart, cuts (5b), shriveling (5c), 
Seab, blight, dry rot, other disease, insects, or 
mechanical or other means (5). 
Unless otherwise specified the diameter (4) of each 
potato shall be not less than 1% inches. (See Size 
Classification, pp. 135 and 136, and Tolerance for Size, 
pp. 1386 and 1387.) 
TOLERANCE FOR DEFECTS 
In order to allow for variations other than size 
incident to proper grading and handling, not more 
