654 THE FUNGI WHICH CAUSE PLANT DISEASE 



of diseased plants. The spores abound on all diseased parts, 

 particularly on the seeds. Infection experiments have demon- 

 strated its pathogenicity. 



F. tabacivorum Del. is said to cause a rot of tobacco in 

 France. 



F. brassicae Thiim. is of economic importance on cabbage.^"* 



Inoculations of an undetermined species of Fusarium in pure 

 culture into soil also resulted in infection of 83% of the cabbage 

 plants grown therein. 



F. decemcellulare Brick and F. theobromse Lutz. occur on 

 cacao. 



F. ricini (Ber.) Bizz. is injurious to the castor oil plant. 



F. incamatum (Desm.) Sacc. is reported as the probable 

 cause of an aster wilt or blight in Europe.^"* An undetermined 

 species is also reported on China aster by Galloway ^'*' ^"^ and 

 others. 



A species of Fusariimi on carnation leaves following in rust 

 sori was reported by Stewart ^"^ and a wilt disease or stem rot of 

 carnation was studied by Sturgis.^"* He found the Fusarium in 

 the affected plants, it was isolated and inoculated into the soil 

 around the roots of carnations producing disease in several in- 

 stances. 



F. pelargonii Crou. is described from geraniums.*'" 



F. dianthi P. & D.*" on Dianthus cuttings, is a woimd parasite, 

 following insect injury. 



F. violae Wolf. 



Infected areas dark, sunken; sporodochia within the host; 

 conidia fusiform-falcate, 28-38 x 4-6 /*> 3 to 5 times septate; 

 hyphae hyaline, 4-7 n in diameter, irregularly branched. It causes 

 a disease of roots and stems of pansy. 



F. pini is believed to be the species responsible for a disease of 

 pine seedlings.*'^ 



F. blasticola Rost. causes death of conifer seedlings in Europe. 



Tuberculariaceae-Dematiae-Amerosporse (p. 638) 



Hyphae olive to brown or black; conidia continuous, rarely 

 hyaline globose to elongate, sometimes imequal. 



