DISEASES OF CELERY 



81 



appearance. Leaf spot is caused by the fungus 

 which bears the name Phyllosticta apii 1 and differs 

 from the blight in that it makes its appearance in 



FIG. 33 CELERY LEAF AFFECTED WITH LEAF-SPOT 



(Phyllosticta apii) 

 (Redrawn from Halsted) 



the form of dark brown spots and gradually spreads 

 until the whole leaf is covered. 



Celery Rust 1 . The true rust of celery is caused 

 by the fungus known as Puccinia bullata, and ap- 

 pears in the form of numerous small, reddish-brown 

 spots on the leaves. Celery rust has not yet made 

 its appearance in this country, but it is only a mat- 

 ter of time until it will become widely distributed. 



Blanch-rot or Heart-rot. Professor Halsted of 



1 New Jersey Expr. Sta. Special Bui. 



