37G STATE BOARD OF AGRICULTURE. 



Spray the celery plants every two or three iceel-s loith home-made Bor- 

 deaux mixture prepared exactly according to directions. Spray oftener 

 if the season is as wet as the past one. 



Fig. 8. Sprayed and unsprayed celery from the Muskegon experiment. 



Bordeaux mixture is a preparation poisonous to fungi and is used to 

 give plants a protective coat. It is simply a dilute solution of Bluestone 

 (or Blue Vitriol), 2%, mixed thoroughly with a dilute milk of lime (2% 

 Stone Lime), applied at once.( Fig. 9). The Bordeaux must be on the 

 plant before the danger period. Therefore spray before rains. The Bor- 

 deaux, if allowed to dry for a half hour will not wash off. Use home- 

 made Bordeaux, since it is cheaper and better than the commercial prod- 

 uct. Celery does not need any lead arsenate or Paris Green. Lime-sul- 

 phur is worthless, for celery — the blight spores can grow in this spray. 



A leaf sprayed once is protected as far as the Bordeaux reaches. The 

 leaves increase in size, thus exposing neAV, tender surfaces. New leaves 

 keep coming. To protect the new growth, spray often. 



For 1 or 2 acres a knapsack sprayer will do (cost about |5.00). A bar- 

 rel pump (to run on boards) will cut down the work of spraying. This 

 requires one man to pump and one to spray. (Cost about |50.00). Large 

 acreages should have a traction or power sprayer (cost about |1 00.00 and 



