DISEASES OF CELERY 85 



stain and discolor the plants and for this reason the 

 ammoniacal solution of copper is more desirable for 

 use on celery. 



Spraying of this nature is frequently performed 

 by means of a knapsack sprayer, but on a large scale 



FIG. 35 THE PROPER WAY TO MAKE BORDEAUX 

 (From W. G. Johnson) 



some form of spraying machine will be desirable. 

 There are several horse-drawn spraying machines 

 upon the market, a number of which are fitted for 

 spraying three to five rows at one time. (See Fig. 

 36.) In spraying celery it should be the aim to 

 reach every part of the plant with a fine spray, and 

 unless the work is done very thoroughly it will fail 

 of accomplishing the desired result. The plants 

 should be sprayed at least once before leaving the 

 plant bed, and from four to six times while in the 

 field. 



