92 THE SUBURBANITE'S HANDBOOK 



is, however, desirable, and it is seldom one has to apply these tests. 



Several standard strengths of Bordeaux have been established 

 and are known by the abbreviated names of the formulae, as follows : 



Full strength (or 4-4-25, formula). That is four pounds copper 

 sulphate, four pounds lime, and 25 gallons water. 



Half strength (4-4-50, formula). 



6-4-50, formula. 



3-6-50, formula. 



2-2-50, formula. 



3-9-50, formula. 



/The last three formulae are suitable for peach and plum foliage, 

 which are liable to burn when full strength mixtures are used. Bor- 

 deaux mixture is also on the market in a dry form and may be used 

 either alone or mixed with the arsenicals and applied with a powder 

 gun. 



SODA BORDEAUX MIXTURE. 



Copper sulphate, four pounds. 



Water, 50 gallons. 



Add enough soda lye to make the mixture alkaline to test paper. 

 This is merely substituting soda for the line and has the advantage 

 of not clogging the spray nozzle, which the lime is apt to do. 



AMMONIACAL COPPER CARBONATE. 



Copper carbonate, five ounces. 



Ammonia (26 degrees Beaume), three pints. 



Water, 50 gallons. 



Dissolve the copper carbonate in the ammonia. This may be 

 kept any length of time without injury if kept in a glass stoppered 

 bottle and can be diluted to the required strength when wanted for 

 use. The solution loses strength on standing. 



COPPER SULPHATE SOLUTION. 



(Strong Solution.) 



Copper sulphate, one pound. 



Water, 25 gallons. 



Applied only on trees without foliage. 



