Potato Diseases 309 



The potato tuber is a thickened stem, with eyes or buds 

 (usually more than one bud in each eye). Fig. 85. The tuber is a 

 storehouse of food, largely starch. The sprouts feed on this food 

 for a time. Fig. 86. In the bin late in spring a potato may throw 

 out a root-like stem and produce new tubers from its own sub- 

 stance. Fig. 87. In some cases a tuber grows inside the old one. 

 The literature of the potato is voluminous, although there is 

 no single commanding book. Consult "The $100 Prize Essay on 

 the Cultivation of the Potato" (Wylie and Compton), pub. by 

 Orange Judd Co.; T. B. Terry, "ABC of Potato Culture;" and 

 E. S. Carman, "New Potato Culture." The " new potato culture " 

 of Carman is the trench or furrow system as distinguished from 

 the hilling sysjtem; this system, adapted to farm conditions, has 

 recently been urged by Roberts and his colleagues in Bulls. ISO, 

 140, 156, Cornell Exp. Sta. 



For some of the recent literature on insects and diseases, see: 

 Stalk weevil, N. J. Bull. No. 109; Kansas No. 82. Remove 



all dead vines; stimulate plant growth if larveB appear. 

 Flea-beetle, N. Y. Bull. No. 113; Cornell No. 113. Use Bor- 

 deaux mixture. 



Rot, Dept. Agric. Rept. 1888, p. 337; N. H. No. 22; Cornell 

 No. 113; Farmers' Bull. No. 91 ; N. Y. No. 123. Bordeaux 

 begun before appearance. 



Early blight, Vt. Rept. 1892, pp. 66-70; Cornell No. H3, col- 

 ored illus.; N. Y. No. 123; Farmers' Bull. No. 91. Use 

 Bordeaux. 



Scab, Ct. Rept. 1890, pp. 81-93, 1891, pp. 153-160; Cornell 

 No. 113; Farmers' Bull. No. 91. Corrosive sublimate 

 (2.5 ounces in 2 gallons hot water; after 12 hours dilute 

 to 15 gallons; immerse !/ hours and dry. Formalin 

 (better not poisonous) 8 fl. ounces formalin (40 per cent 

 formic aldehyde) with 15 gallons water. Soak 2 hours. 

 Diseases in general, Vt. No. 72. Very good re'sume' of ten 



years' work. 

 Insects, Me. No. 68. 



