FUNGI IMPERFECTI (dEUTEROMYCETES) 269 



especially wilt diseases. Fusarium oxysporum and T. trichorthecoides 

 can produce both tuber rot and wilt of the potato plant. Fusarium 

 viola causes violet leaf spot (Fig. no). Ftisarium bat at atis is respon- 

 sible for sweet potato stem rot (Figs. 108 and 109). 



The sterile fungus Rhizoctonia, represented in America by two para- 

 sitic species Rhizoctonia solani, which is found on at least 165 different 

 hosts, and R. crocorum with a limited distribution on alfalfa and potato 

 tubers has through the discoveries of Rolfs and Burt been connected 

 with a basidiomycetous fungus, Corticium vagum var. solani.^ 



1 Peltier, George L. : Parasitic Rhizoctonias in America. Bull, 189, Agri. 

 Exper. Stat. University of Illinois, June, 1916. 



