CHAPTER VIII 



SPRAYING MIXTURES 



SPRAYS FOR FUNGOUS DISEASES 



Bordeaux Mixture. Bordeaux mixture is one of the 

 standard fungicides and is used especially for fungous 

 diseases of the potato, grape, currant, gooseberry, apple, 

 pear, and European plum. 



Formula : 



Copper sulphate 4 Ib. 



Lime 4 Ib. 



Water 50 gal. 



This spray proves most efficient when used directly after 

 mixing. To facilitate the work, the fruit grower dissolves 

 the copper sulphate hi fairly large quantities, and slakes 

 lime ready for use. In making the mixture, success de- 

 pends largely upon the way the copper sulphate and lime 

 are united. Each should be diluted as much as necessary 

 before mixing. In making 50 gallons of Bordeaux, the 

 copper sulphate should be diluted to 25 gallons and the 

 lime to 25 gallons before pouring them together. If the 

 mixture is improperly made, it will appear very flocculent 

 and settle rapidly, while a good mixture appears creamy 

 and stands for some time without settling. Only the best 

 fresh stone lime should be used. Prepared or hydrated 

 lime is sometimes used when stone lime is not available. 



Strong Copper Sulphate Solution. Strong copper sul- 

 phate solution is sometimes used as a fungicide to apply 



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