THE CELERY BLIGHT 



145 



for some time ; then certain branches of the mycelium 

 are pushed through the breathing pores^ or stomata^ of 

 the leaf, and produce on their tips the spores. Fig. 62 

 5, represents a sectional view of a leaf having the myce- 

 lium developed among the cells, and the spore-producing 

 branches coming out through a breathing pore. In a, 

 of the same figure, two spores in process of germina- 



a h 



FIG. 62. CELERY LEAF-SPOT. 



a, Spores germinating; 5, section of leaf showing fungus. Magnified, 



tion are represented. Xo winter spores have yet been 

 discoTcred. 



It has been found, in some localities, that celery 

 growing in the shade is seldom affected by this fungus. 

 Hence it is recommended that, unless fungicides are to 

 be employed, as advised below, the celery bed be placed 

 in situations shaded by trees ; or that it be artificially 

 10 



