FUNGICIDES 255 



contain 2 pounds of copper sulfate. Slake a barrel of lime, and 

 store in a tight barrel, keeping it covered with water. Lime so 

 treated will keep all summer. It is really hydrated lime. This is 

 often dried, pulverized, and offered on the market in paper bags 

 of 40 pounds, each, under such names as ground lime, prepared 

 lime, hydrated lime, etc. If the paper is not broken, the lime does 

 not air-slake for a long time. One and one third pounds of hydrated 

 lime equals in value one pound of quicklime. Air slaked lime 

 cannot be used in preparing bordeaux mixture. 



Arsenical poisons can be combined with bordeaux mixture. 

 See Chapter XVII, page 290. 



Ammoniacal copper carbonate. — For use on nearly mature fruit and on 

 ornamentals. Does not discolor. Weigh out 3 ounces of 

 copper carbonate, and make a thick paste with water in a wooden 

 pail. Measure 5 pints of strong ammonia (26° Beaum6) and 

 dilute with three or four parts of water. Add ammonia to the 

 paste, and stir. This makes a deep blue solution. Add water 

 to make 50 gallons. 



Copper carbonate. — For use in the above formula, it may be obtained 

 as a green powder, or maybe prepared as follows: Dissolve 12 

 pounds of copper sulfate in 12 gallons of water in a barrel. 

 Dissolve 15 pounds of sal soda in 15 gallons of water (pref- 

 erably hot). Allow the solution to cool; then add the sal soda 

 solution to the copper sulfate solution, pouring slowly in order to 

 prevent the mixture from working up and running over. A fine 

 precipitate is formed which will settle to the bottom if allowed 

 to stand over night. Siphon off the clear liquid. Wash the pre- 

 cipitate by adding clear water, stirring, and allowing to settle. 

 Siphon off the clear water, strain the precipitate through muslin, 

 and allow it to dry. This is copper carbonate. The above 

 amounts will make about 6 pounds. 



Copper sulfate. — See Sulfate of Copper, p. 258. 



Corrosive sublimate (mercuric bichloride) . — Used for disinfecting 

 pruned stubs and cleaned-out cankers, at the rate of one part in 

 1000 parts of water. Can be secured from the druggist in tablet 

 form in vials of 25 each, and costing 25 cents. One tablet 

 makes a pint of solution. Make and store solution in glass and 

 label poison. 



