SPRAYING 77 



spraying are apple scab, apple tree canker, peach 

 leaf curl and black knot of plum. 



BORDEAUX MIXTURE 



The standard solution for the prevention of 

 fungous attacks is the bordeaux mixture composed 

 of lime and copper sulphate. This is the great and 



FIG. 39 SPRING CAMPAIGN AGAINST SAN JOSE SCALE 



original spraying solution, and the one still most 

 widely used. It is effective in the prevention of 

 most preventable fungous diseases, particularly the 

 apple scab. The standard formula is as follows : 



Copper sulphate (blue vitriol) 4 pounds 

 Good stone lime, unslaked, 4 pounds 

 Water, 50 gallons 



The copper sulphate should be separately dis- 

 solved. The best way to do this is to place it in a 



