82 



CELERY CULTURE 



the New Jersey station describes a bacterial disease 

 which attacks the hearts of celery, causing them to 

 decay very quickly, especially in the presence oi 

 warmth and considerable moisture. This is evi- 

 dently the disease which frequently causes the loss 

 of celery in storage. When attacked by this disease, 



FIG. 34 CELERY LEAF AFFECTED WITH RUST (Puccinia 

 ENLARGED PORTION AT RIGHT 

 (Redrawn from Halsted) 



the stalks, and especially those in the heart of the 

 plant, turn a dark brown or black color, soften and 

 decay very quickly. This disease is often observed 

 where celery is blanched by means of boards during 

 extremely warm weather. The blanch-rot or heart- 

 rot can be controlled in the storage house by ven- 

 tilation, cooling, and care that the tops of the celery 

 do not become wet. 



Root-knot. This disease appears in the form of 

 numerous nodules upon the roots of celery, and is 

 caused by the fungus Heterodera radicicola. Root- 



