260 Subtropical Vegetable-Gardening 



the potatoes. It is spread by using sets from diseased 

 potatoes. 



The liability to fungous diseases is lessened by using 

 only cuttings from healthy vines to plant the fields, and 

 by practicing rotation. 



Varieties of sweet potatoes. 



The varieties that give a very large yield do not make, 

 as a rule, good table potatoes, and are generally grown for 

 stock-feeding. 



In the North the sweet potato is usually boiled and a 

 dry starchy one is preferred ; in the South the potato is 

 usually baked and a sugary moist-fleshed one is in demand. 

 Big-stem Jersey, Yellow Jersey, and Red Jersey are the 

 most extensively grown varieties of the floury type. 

 The moist sugary potatoes are usually known as yam 

 potatoes, and among those grown for table use are Georgia 

 Yam, Pumpkin Yam, Southern Queen, and Vineless. 

 Triumph and Providence are favorites in Florida. Nancy 

 Hall is also grown extensively there. 



There are about a hundred varieties, or about that 

 many different names occur for varieties. The term 

 yam should be omitted whenever practicable, as this 

 refers to an entirely different vegetable. It pays to raise 

 some mealy early varieties for shipping north. These 

 always bring a good price, but are usually a home-grown 

 product, because southern varieties are not shipped in. 



Bulletins. 



Fungus Diseases of Sweet Potatoes, N. J. Exp. Sta. Bulletin 76, 

 1890. 



