i 7 8 TREES AS GOOD CITIZENS 



sprayed and the disease to be treated. The following 

 formula is quite satisfactory for general work: 



Copper sulphate (bluestone) pounds 3 



Quicklime pounds 4 



Water to make gallons 50 



For severe diseases on trees with resistant foliage it is 

 often advisable to use 4 pounds of bluestone and 6 pounds 

 of lime to 50 gallons of water instead of the above formula. 



Directions for Making. To make a single barrel 

 of Bordeaux mixture, dissolve the bluestone in 25 gallons 

 of water and in a separate vessel slake the lime and dilute 

 it to 25 gallons. Then pour the two solutions simulta- 

 neously through a strainer into the spray tank. 



If large quantities are to be used, stock solutions of 

 the bluestone and lime should always be prepared, thus 

 saving the time necessary to dissolve the materials. A 

 stock solution of the copper sulphate may be made by 

 dissolving it at the rate of 1 pound to each gallon of water. 

 Fill a 50-gallon barrel two-thirds or three-fourths full of 

 water and place a sack (or box with perforations in the 

 bottom and sides) containing 50 pounds of copper sulphate 

 in the upper part of the barrel, suspending it by a string or 

 copper wire. In from 12 to 24 hours the sulphate will have 

 entirely dissolved, and the sack or box should be removed 

 and enough water added to fill the barrel. After slight 

 stirring, the solution is ready for use. The stock lime may 

 be prepared by slaking 50 pounds in a barrel or other 

 vessel, and finally adding water to make 50 gallons. In 

 slaking the lime sufficient water should be used to prevent 

 burning, but not enough to "drown" it, and the mass 

 should be continually stirred with a shovel or spading fork 

 until a thin paste is formed. 



In making Bordeaux mixture, take the necessary quan- 

 tities of the stock copper sulphate and the stock lime 



