xni, A, 5 Reinking: Philippine Economic-Plant Diseases 257 



STANDARD BORDEAUX MIXTURE 



Materials. 



Copper sulphate (blue vitriol), kilos 1.8 



Stone lime, kilos 1.8 



Water, liters 190 



The amount of copper sulphate can be varied according to the 

 formula given. The weight of stone lime should be equal to 

 or exceed the weight of copper sulphate. The important point 

 to consider in regard to the materials is that good unslaked 

 stone lime must be used. Bordeaux mixture cannot be prepared 

 with air-slaked lime. 



APPARATUS 



Two half -barrels with a capacity of about 11.5 liters, made by sawing in 



two a 230-liter barrel. 

 One 230-liter mixing barrel. 

 Two or more wooden pails. 

 One strong paddle, about 2 meters long. 

 One pair of hand scales. 



PREPARATION 



1. Dissolve 1.8 kilograms of copper sulphate in hot water, place in half- 



barrel, and add water to make 95 liters. 



2. Slake 1.8 kilograms of stone lime in the second half-barrel and add water 



to make 95 liters. 



3. Mix solutions by having two operators, each provided with a bucket. 

 Dip up equal amounts of the copper sulphate and lime solutions and 



pour them together, at the same rate, at a height of 60 to 90 centi- 

 meters above a mixing barrel (Plate XXI, fig. 2). 



4. Mix the whole thoroughly by stirring vigorously. 



5. Strain the mixture when putting into the spray tank. 



6. Apply to the plants with a good pressure spray pump. Use as soon 



as made. 



If other than the above formula be given, take respective 

 pounds as indicated in formula. For example, to make a pre- 

 paration containing 1.8 kilograms of copper sulphate, 2.25 kilo- 

 grams of stone lime, to 190 liters of water, take 1.8 kilograms 

 of copper sulphate and dissolve in 95 liters of water, slake 2.25 

 kilograms of stone lime, and add water to make 95 liters. Mix 

 the two as before indicated. 



The two solutions may be mixed by pouring the dilute solu- 

 tion of copper sulphate into a strong solution of lime and then 

 thoroughly mixing the two and making them up to 190 liters. 



BURGUNDY MIXTURE 



This preparation may be used in place of the Bordeaux mix- 

 ture, if it is impossible to obtain good stone lime. Burgundy 

 mixture will not color the foliage and fruit to such a great extent 



