146 



FUXGI AXD FUNGICIDES 



shaded by screens of lath, or similar material. It is 

 important, also, that refuse leaves affected by the dis- 

 ease be gathered and burned. 



Literature. — Articles concerning this fnngns occur 

 in the United States Department of Agriculture reports 

 for 1886 (pp. 117-120) and 1888 (pp. 398-399) ; Bui- 



FIG. 63. CELERY LEAF IXJTRED BY LEAF-BLIGHT. 



letin 2, Xew Jersey Experiment Station^ and 1891 report 

 (pp. 250-253) ; also Bulletin Xo. 51^ Xew York Experi- 

 ment Station. 



The Celery Leaf=blight 



Septoria petroselini, var. apii 



This is a disease somewhat similar to the blight 

 already described, which attacks all portions of tiie cel- 

 ery plant except the root. Its presence is commonly 

 first shown by the appearance, on the leaves or stems, of 

 watery areas, which soon afterwards become spotted 



