Fig. 63. Potato Diseases. 



a. Powdery dry rot, b, Rhizoctonia lesion on young potato sprouts (after W. 

 Orton), c. Rhizoctonia sclerotia on seed potato t"^'»« ** -mfA^r-rR Artificiallv 



duced by inoculating with a pure culture of Sc/e--'-" - ■'^-^ -, 



S. Rolfsii. 



