TREE DISEASES AND TREATMENT 179 



solutions to give the formula in the total amount of water 

 to be used and place each in separate elevated dilution 

 tanks, which should hold half as much as the total capa- 

 city of the spray tank. Thus, if the spray tank holds 200 

 gallons, each dilution tank should hold 100 gallons; and, 

 according to the above formula, 20 pounds of copper sul- 

 phate (20 gallons of the stock solution) and 20 pounds of 

 lime (20 gallons of stock solution) would be required. To 

 each dilution tank add water (one-half the total amount 

 of spray) and after stirring, allow the diluted ingredients 

 to run, through separate hose or troughs attached to 

 faucets near the bottom of the tank, into the strainer on 

 the spray tank, where the two solutions come together, 

 producing the Bordeaux mixture. Only the quantity 

 which can be used during the day should be mixed, as the 

 Bordeaux mixture deteriorates on standing. 



In case the dilution tanks are not elevated to admit 

 of filling the spray tank by gravity, the diluted solutions 

 must be dipped and poured into the latter by hand, a 

 bucketful of each simultaneously. This method is advis- 

 able in small operations, where a few barrels at most are 

 needed. 



It is important that Bordeaux mixture should be 

 thoroughly strained in order to keep out any coarse parti- 

 cles that would clog the spray nozzles, and it is a good 

 practice to strain the stock solution of lime while pouring 

 it into the dilution tank. The best material for a strainer 

 is brass wire netting of about 20 meshes to the inch. 



Ammoniacal Copper Carbonate. The formula for 

 ammoniacal copper carbonate is as follows: 



Copper carbonate ounces 5 



Strong ammonia (26 Baume) pints 2 to 3 



Water to make gallons 50 



