X2G Bulletin 188. 



be explained. As boiiglit at the drug store, it is a yellow crystal 

 and is easily soluble in water. Ten cents' worth will do for a 

 season's spraying of an average orchard. It should be a full satura- 

 tion ; that is, use only enough water to dissolve all the crystals. 

 The cork should be notched or a quill inserted so that the contents 

 will come out in drops. A drop will give as reliable a test as a 

 spoonful. The bottle should be marked " Poison." Dip out a little 

 of the Bordeaux mixture in a cup or saucer, and drop the ferro- 

 cyanide on it. So long as the drops turn yellow or brown on strik- 

 ino; the mixture, the mixture has not received enou2;li lime. 



Ammoniacal Copper Carbonate. 



Copper carbonate 5 oz. 



Ammonia (2G° Beaume) 3 pints 



"Water 45 gals. 



Make a paste of the copper carbonate with a little water. Dilute 



the ammonia with 1 or 8 volumes of water. Add the paste to the 



diluted ammonia and stir until dissolved. Add enough water to 



make 45 o-allons. Allow it to settle and use onlv the clear blue 



liquid. This mixture loses strength on standing. For fungous 



diseases. 



Copper Sulfate Solution. 



Copper sulfate 1 pound 



AVater 15-25 gallons 



Dissolve the copper sulfate in the water, when it is ready for use. 



This should never he applied to foliage hut must he used hefore the 



huds hreak. For peaches and nectarines, use 25 gallons of water. 



For fungous diseases, but now largely supplanted by the Bordeaux 



mixture. A much weaker solution has been reconunended for trees 



in leaf. 



Iron Sulfate and Sulfuric Acid Solution. 



Water (hot) 100 parts 



Iron sulfate, as much as the water will 



dissolve. 

 Sulfuric acid (commercial) 1 part 



The solution should be prepared l^efore using. Add the acid to 

 the crystals, and then pour on the water. Sometimes reconunended 



