APPENDIX. 269 



COPPER SULPHATE SOLUTION. 



Copper sulphate 3 pounds 



Water 50 gallons 



The manner of making this solution is the same as for the bor- 

 deaux mixture, except that lime is not added. This solution is 

 very injurious to plants in foliage; therefore it should be applied 

 only during the dormant period. 



COPPER ACETATE SOLUTION. 



Dibasic acetate of copper 6 ounces 



Water 50 gallons 



Add the acetate of copper to the water and stir thoroughly. 

 Although this mixture is much inferior to the bordeaux mixture 

 as a fungicide, it can be applied to ripening fruit without the 

 staining effect of the latter. The copper acetate solution is in- 

 jurious to the foliage. 



AMMONIACAL COPPER CARBONATE. 



Copper carbonate 5 ounces 



Strong ammonia (26 Baume) 2 to 3 pints 



Water to make 50 gallons 



(1) Dilute the ammonia with about two gallons of water in 



order to increase the solvent action of the ammonia upon 

 the copper carbonate. 



(2) Add water to the carbonate to make a thin paste. 



(3) Pour on about half of the diluted ammonia, stir vigorously 



for several minutes, allow it to settle, pour off the liquid, 

 leaving the undissolved copper salt behind. Repeat the 

 operation until all the salt is dissolved. 



(4) Add the remainder of the water to make 50 gallons. 



This mixture is inferior to the bordeaux mixture as a fungi- 

 cide. It is used as a substitute for bordeaux mixture when stains 

 upon ornamental plants and maturing fruits are objectionable. 

 Plants susceptible to injury from the bordeaux mixture are also 

 likely to be injured by the ammoniacal copper carbonate solution. 



EAU CELESTE (MODIFIED). 



Copper sulphate 4 pounds 



Ammonia 3 pints 



Sal soda 5 pounds 



Water to make 45 gallons 



Dissolve the copper sulphate in 10 or 12 gallons of water, add 

 the ammonia and dilute to 45 gallons; then add the sal soda and 

 stir until dissolved. Eau celeste is an effective dormant spray for 

 the peach leaf curl and other similar diseases, but it is unsafe 

 to use on the foliage of most plants. 



