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 ol 

 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 bullata) 



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 Hctcrodcra radicicola. Root- 



