320 



FUNGOUS DISEASES OF PLANTS 



about 2 ounces to each 5 gallons of water. The treatment should 

 be given while the seed are spread out on a floor or canvas, and as 

 the seed are sprinkled the grain must be handled continuously with a 

 shovel or rake, so that they may be moistened, but not wet, through- 

 out. Subsequently, they should be handled until dry. Preceding 

 this treatment, moreover, the seed should be thoroughly cleaned in 

 the fanning mill. All straw, chaff, and other refuse from the pre- 

 vious crop should be taken from the land, as far as practicable. 



XXIV. FUSARIUM: OTHER SPECIES 



It is apparent that the old view, which held species of the 

 genus F'usarium to be largely saprophytic, must be considerably 



modified. It is a genus 

 which will well reward the 

 student who may devote 

 himself to it. 



Reed 1 has recently de- 

 scribed a disease of the 

 ginseng caused by a spe- 

 cies of Fusarium. The 

 cultural characters of the 

 organism isolated led him 

 to believe that it is at least 

 the same species as that 

 producing the wilt of cot- 

 ton and other plants, and 

 although the ascigerous 

 stage was not found, he re- 

 ferred it to Neocosmospora 

 vasinfecta (Atk.) Erw. 

 Smith. 



A destructive stem blight 

 FIG. iC2. CHINA ASTER AFFECTED BY _. , . . 



FUSAR.UM (F'gS- '5 I, 152) of the 



China aster, Callistephus 

 hortensis Cass., has been attributed to a Fusarium, but a complete 



1 Reed, H. S. Diseases of the Cultivated Ginseng, Missouri Agl. Exp. Sta. 

 Built. 69 : 43-65. figs. 1-8. 1905. 



