Pests and Diseases 75 



Ammoniacal solution of copper carbonate will be found 

 applicable in places where the bordeaux mixture would 

 cause a bluish green stain and so cause the product to be 

 less salable, as in the case of maturing tomato fruits, snap 

 beans, and the like. It does not have the lasting qualities 

 of bordeaux mixture, but is much more easily prepared. 

 In addition to this it may be used much more success- 

 fully to reach fungi inhabiting the soil, especially those 

 fungi that attack the plants near the surface of the ground. 



Copper carbonate, 5 ounces. 

 Ammonia water 26° Baum6, 3 pints. 



For use the solution should be diluted to 50 gallons. 

 One gallon of water is poured into a wooden or earthen 

 vessel, the 3 pints of ammonia added and stirred so as to 

 mix evenly. The 5 ounces of copper carbonate are shaken 

 in the ammonia water, stirring the liquid all the time. 

 If the copper carbonate all dissolves, an additional amount 

 is put in until a small quantity remains undissolved. 

 When the undissolved copper carbonate has settled to the 

 bottom, the clear, blue liquid is poured off into some vessels 

 that can be tightly corked, such as jugs, or bottles. 

 The writer's experience has been that this stock solution 

 does not keep well for more than a few days to a week or 

 two, even in tightly corked vessels; consequently, the 

 material should be made up just at the time when it is 

 to be used. 



SPRAYING MACHINES 



In the last twenty-five years the number of devices 

 that have been invented for applying fungicides and in- 



