152 MISC. PUB. 190, U.S. DEPT. OF AGRICULTURE 
UNITED STATES STANDARDS FOR SWEET- 
POTATOES 
(Effective May 12, 1926) 
GRADES 
U.S. No. 1 shall consist of sweetpotatoes of similar 
varietal characteristics which are firm, not badly mis- 
shapen; which are free from black rot, decay, and 
freezing injury; and free from damage caused by 
dirt, secondary rootlets, bruises, cuts, scars, growth 
cracks, scald, scurf or other diseases, weevils or other 
insects, and by mechanical or other means. 
Unless otherwise specified the diameter of each 
sweetpotato shall not be less than 1%4 inches nor 
more than 3% inches, and the length shall not be 
less than 3 inches nor more than 10 inches, but the 
length may be less than 3 inches if the diameter is 
2 inches or more. 
TOLERANCES.—In order to allow for variations other 
than size, incident to proper grading and handling, 
not more than 10 percent, by weight, of the sweet- 
potatoes in any lot may be below the requirements of 
this grade, but not to exceed a total of 5 percent, 
shall be allowed for defects causing serious damage, 
and not more than one fifth of this amount, or 1 per- 
cent, shall be allowed for sweetpotatoes affected with 
soft rot. 
In addition, not more than 10 percent, by weight, of 
the sweetpotatoes in any lot may not meet the size 
requirements, but not more than one half of this 
tolerance, or 5 percent, shall be allowed for sweet- 
potatoes which are below the minimum size require- 
ments. 
U.S. No. 2 shall consist of sweetpotatoes of similar 
varietal characteristics which are firm and which are 
free from black rot, decay, and freezing injury; and 
free from serious damage caused by dirt, bruises, cuts, 
Scars, growth cracks, scald, disease, weevils or other 
insects, and mechanical or other means. 
Unless otherwise specified the diameter of each 
Sweetpotato shall not be less than 14% inches nor more 
than 4 inches. . 
TOLERANCES.—In order to allow for variations other 
than size, incident to proper grading and handling, 
not more than 10 percent, by weight, of the sweet- 
potatoes in any lot may be below the requirements of 
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