XIII. A. 5 Reinking: Philippine Economic-Plant Diseases 259 



Matenals. 



Concentrated ammonia (26° Baume), liters 1.5 



Copper carbonate, grams 168 



Water to make, liters 190 



APPARATUS 

 One 190-liter mixing barrel. 

 Two or more wooden pails. 

 One strong paddle, about 2 meters long. 

 One pair of hand scales. 

 One strainer, of cloth. 



PREPARATION 



1. Measure 1.5 liters of concentrated ammonia into a wooden bucket and 



dilute to 10 liters. 



2. Add to this 168 grams of copper carbonate and stir until all is in 



solution. 



3. Dilute this stock solution to 190 liters before spraying. 



4. Strain the mixture into a spray tank and apply as directed under Bor- 



deaux mixture. 



Never use metal vessels in the preparation of this mixture. 

 Use only wooden or earthenware utensils. The spraying ap- 

 paratus should be thoroughly rinsed after spraying. 



RESIN-SALSODA STICKER 



In spraying during the rainy season especially on those plants 

 the foliage of which has waxy surfaces, it is highly desirable 

 to add a sticker to the spray mixtures. 



Materials. 



Resin, kilo 0.9 



Salsoda (sodium carbonate), kilo 0.45 



Water, liters 3.8 



APPARATUS 



A kerosene tin or similar utensil for boiling the solution. 



A paddle. 



A pair of hand scales. 



PREPARATION 



1. Dissolve 0.45 kilogram s'alsoda in 3.8 liters of water and boil. 



2. Add 0.9 kilogram of powdered resin and continue boiling, until all is 



dissolved and the contents are a clear brown. Care should be taken 

 that the mixture does not boil over. 



For a medium adhesive add 1.9 liters of this sticker to 190 

 liters of the spray. 



SULPHUR 



For the control of powdery mildews and other superficially 

 growing fungi, flowers of sulphur, or sulphur flour, may be used 

 to the best advantage. 



The sulphur is dusted on affected plants, preferably when the 

 plants are wet with dew or rain. 



