146 MUCK CROPS 



Cultivation. The plants should be culti- 

 vated often, and the work should not be 

 made deep enough to do injury to the roots, 

 as they come very close to the surface of 

 the soil. At least five cultivations during 

 the season are necessary. 



Irrigation. The same system mentioned 

 under early celery may be used with late 

 celery. It is, however, generally considered 

 of less importance with the late than with 

 the early crop. 



Spraying. It is necessary to spray celery 

 from the very first. The celery is troubled 

 by the early blight, Cercospora apii, and the 

 late blight, Septoria pelroselini variety apii. 

 These blights cause discolorations upon the 

 leaves, causing the whole plant to wilt 

 quickly, and thus reduce the crop. They 

 may be somewhat easily controlled if 

 thorough spraying is given. This spraying 

 should be from five to seven times during the 

 season. Celery has two other diseases, leaf 

 spot, Phyllosticta apii, and rust, Puccinia 

 bullata. There is a difference to the scientist 

 between all of these diseases. Probably to 

 the average farmer but little difference is ap- 

 parent. Bordeaux mixture applied often 



