STANDARDS FOR FRUITS AND VEGETABLES 133 
“Size” means the smallest diameter measured 
through the center of the plum or prune at right 
angles to a straight line running from the stem to 
blossom end, 
UNITED STATES STANDARDS FOR 
POTATOES 
(Effective Sept. 15, 1933) 
INTRODUCTION 
Numbers and letters in parentheses following grade 
terms indicate where such terms are defined on pages 
137 to 189 under Definitions of Terms. 
All percentages shall be calculated on the basis of 
weight. 
The tolerances specified for the various grades shall 
be placed on a container basis. However, any lot of 
potatoes shall be considered as meeting the require- 
ments of a specified grade if the entire lot averages 
within the tolerances specified, provided that the 
defects in any container based on sample inspection 
do not exceed the following amounts: 
For a specified tolerance of 10 percent or more, not 
more than one and one half times the tolerance shall 
be allowed for any one container. 
For a specified tolerance of less than 10 percent, not 
more than double the tolerance shall be allowed for 
any one container. 
GRADES 
U.S. No. 1 shall consist of potatoes of similar 
varietal characteristics which are fairly well shaped 
(1), free from freezing injury, blackheart, and soft 
rot or wet break-down (2), and from damage (38) 
caused by dirt (38a) or other foreign matter (8a), 
sunburn, second growth (3b), growth cracks (3b), air 
cracks (3c), hollow heart, cuts, shriveling (3d), 
sprouting (8e), scab (8f and g). blight, dry rot, 
rhizoctonia (3h), other diseases (3), insects or me- 
chanical or other means (8). 
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 1387.) 
