r 



Fig. 62. Potato Diseases. 



a. Early blight (after L. R. Jonej), 6. spores of the early blight fungus, c. silver 

 scurf, d. conidiophores and conidia of the silver scurf fungus, e. and /. Fusarium 

 oxysporum wilt in tubers, g. chlamydospores and one to several celled conidia of 

 F. oxysporum, h. conidiophores of F. oxysporum {g. and h. after Sherbakoff), i. Ver- 

 ticillium wilt (after Orton). 



