364 



STATE HORTICULTURAL SOCIETY. 



occurred Aug. 4 and 13, probably washing a considerable part of the solu- 

 tion which had been applied from the foliage. Much rain fell after the 

 last applications, which occurred Aug. 19, 21, and 25. 



CARBONATE OF COPPER (COMMERCIAL) AND ARSENITES. 



The carbonate of copper is one of our most valuable fungicides. 

 When dissolved in ammonia it is more easily applied than the Bordeaux 

 mixture, and is usually as effective. The arnmoniaeal carbonate of copper 

 is generally made by dissolving 3 ounces of the carbonate in 1 quart of 

 strongest ammonia, and diluting this with 22 gallons of water. This for- 

 mula is recommended by most of the experiment stations ; the solution has 

 been tested upon all the plants used in these experiments, except the 

 peach and the egg-plants, and the foliage is not injured by its use. As 

 this fungicide was in no case applied stronger than is here given, any 

 injury which may have followed the applications can not be ascribed to 

 the ammoniacal carbonate of copper alone, unless it is in the case of the 

 peach. 



The carbonate of copper was applied in twelve different combinations; 

 the following tables show the amount of injury done by each: 



No. 1. The ammoniacal carbonate of copper, 3 ounces of the carbonate 

 dissolved in 1 quart * of ammonia and diluted with 22 gallons of water. 

 Paris green at the rate of 1 pound to 200 gallons of water. 



The action of these two solutions as fungicides was determined upon 

 the quinces. The Angers is more susceptible to the attacks of the fungus 

 (Enlomosporium maculatum) with which the trees were affected, than 

 other varieties. The Meech was much more free from the disease, but 

 still there was enough present to show the effect of the applications. 



* The ammonia used in all the experiments was very strong— 26° Bauuie. 



