FUNGICIDES 25 



infected stock, particularly peach yellows and rosette, the 

 various crown galls, and certain insect pests, are inoperative 

 on account of lack of proper means of enforcement or too 

 often owing to absence of the necessary sustaining public 

 opinion. 



FUNGICIDES 



Bordeaux mixture. — While the early formulas for this 

 mixture called for 6 pounds of copper sulphate and 4 pounds 

 of lime to 22 gallons of water, and other similarly strong mix- 

 tures were in use for several years, experimental evidence 

 soon showed that the strength could be reduced without 

 disadvantage. The chief strengths of Bordeaux now used 

 are as follows : — 



Ordinary Bordeaux 



5 — .5 ~ 50 



Copper sulphate (bluestone) 5 pounds 



Quicklime 5 pounds 



Water 50 gallons 



This strength may be used on most plants the foliage 

 of which is not especially delicate or sensitive to copper. 



Strong Bordeaux 



6 — 4 — 50 



Copper sulphate (blue stone) G pounds 



Quicklime 4 pounds 



Water . 50 gallons 



