Vegetables with Edible Tubers or Roots 259 



placing them in dry sand or dry cottonseed hulls and 

 keeping in a cool place. These methods may be used to 

 keep them over from the time of taking out of the bank 

 until new ones come on. The cooler the storage of sweet 

 potatoes without freezing, the better they will keep. Just 

 after they are put into piles, there will be a period of sweat- 

 ing ; during this time the temperature is liable to run up to 

 80° F., but no trouble need be anticipated from this soiu-ce. 



Marketing. 



Sweet potatoes for shipping should be graded into two 

 or three grades. They are shipped in double-headed 

 ventilated barrels, holding eleven pecks. The yam 

 varieties of sugary sweet potato are becoming somewhat 

 more popular in the northern markets in the spring. 



Uses. 



Sweet potatoes can be easily dried in an evaporator 

 after boiling and slicing, and there is some demand for 

 the canned article. 



One of the mot promising uses is to feed to stock. The 

 vines may also be used as hay. 



Enemies. 



The worst insect enemy of the sweet potato is the root- 

 borer or weevil. This is found throughout the tropics 

 and is spreading in some of the Gulf states. It may be 

 checked by the destruction of all infested potatoes and by 

 change of land. 



The black-rot is one of the worst fungous diseases. It 

 attacks the young shoots and forms brownish patches on 



