108 DISEASES OF GINSENG. 



CHAPTER XXVI. 



Bordeaux, What It Consists Of And How Prepared. 



Bordeaux mixture derives its name from the place of its 

 discovery, Bordeaux, France. It consists of copper sulphate, 

 which is commonly called blue vitriol or bluestone, fresh lime, and 

 water. 



Several strengths of the mixture are used under different 

 conditions. The formula found to be efficient for spraying ginseng 

 plants is known as a 3-3-50 solution. 



HOW PREPARED. Take three pounds of good unslaked stone 

 lime, slake it in hot water, and, after it is slaked, add enough cold 

 water to make twentyfive gallons. Then put three pounds of cop- 

 per sulphate in to an old basket or sack and hang it near the top of 

 twentyfive gallons of water in another vessel. The reason for 

 hanging it near the top, is that the dissolved copper will go to the 

 bottom of the vessel and give the water an opportunity to fully 

 dissolve the whole amount in a few hours. Were you to simply 

 place the sulphate in the water and not stir it often, you would 

 find that it was not all dissolved. The copper sulphate solution 

 must not be kept in a metal vessel, for it would decompose the 

 copper. 



The above solutions constitute what we will call ,, stock- 

 solutions," and must be kept separate until ready to spray. 



When ready to spray, stir each solution, take a pailful 

 of equal size of each, and pour both at the same time (Fig. 44) into 

 a third vessel. This makes bordeaux, and it is now ready for use. 



Before using, stir the bordeaux and strain through a brass 

 wire screened funnel into the sprayer. (If insects are to be de- 



