FIG. 58. POTATO DISEASES. 



a. Leaf roll, b. curly dwarf (a. and 6. after Appel), c. net necrosis, d. spindly sprout, 

 e. black heart, /. hollow heart (d. to /. after Stakman and Tolaas), g. mosaic, h. tip 

 burn (c. g. and h. after W. A. Orton). 



