FORTY-SECOND ANNUAL REPORT. 



163 



ment Station ; one apple tree, badly infested with the San Jose scale 

 was sprayed in March 1912. Frequent examinations indicated that 

 the scale was destroyed. More extensive experiments are in progress. 



BORDEAUX MIXTURE. 



Bordeaux mixture is made of copper sulphate, lime and water. 



These three substances are combined in various proportions, depend- 

 ing upon the kind of plant to be treated. For apples, pears, cherries and 

 plums (except Japanese varieties) the preparation is usually four 

 pounds of copper sulphate, with about the same amount of lime, to fifty 

 gallons of water. Poison is added as needed. The copper sulphate will 



readily dissolve in two gallons of hot water, to which should be added 

 enough water to make twenty-five gallons or one-half barrel. Do not use 

 an iron or tin vessel to dissolve this in, as the copper sulphate will de- 

 stroy it, and besides the iron will spoil the Bordeaux. A wooden pail 

 is good. Slake the lime into a thin paste and add water to make twenty- 

 five gallons. Pour, or let these run together into a third barrel, and the 

 Bordeaux is made. When it is emptied into the spray barrel or tank, it 

 should be strained through a brass wire strainer to catch any of the 

 coarse particles. 



Whenever it is necessary to use a quantity of the mixture, it is de- 

 sirable to have the lime and the copper sulphate in ''stock solutions." 

 A quantity of lime is slaked to a paste and held so by being covered 

 with water. The copper sulphate, say fifty pounds, is placed in a clean 



