no DISEASES OF THE SWEET PEA 



height of about eight to ten inches when 

 they are attacked by the fungus. If the 

 collapsed seedlings are allowed to remain 

 on the ground, the dead stems will soon be 

 covered with the sickle shaped spores. 

 Eventually the dead tissue rots and dis- 

 integrates and is soon invaded by small 

 fruit flies which now begin to distribute 

 the spores of the fungus to different places 

 in the same house. 



Pathogenicity. The pathogenicity of 

 this fungus is readily proven by inoculat- 

 ing a pure culture (fig. 9) of the fungus 

 into healthy seedlings planted in sterile 

 pots and soil. The seeds germinate and 

 grow up to a height of seven to eight inches 

 and then succumb to the parasite which 

 was artificially introduced into the soil 

 (fig. 11). 



The Fungus. The mycelium of the 

 fungus is hyaline, branched and septate. 



