180 TREES AS GOOD CITIZENS 



Dilute the ammonia with about 2 gallons of water, as 

 it has been found that ammonia diluted seven or eight 

 times is a greater solvent for copper carbonate than the 

 concentrated liquid. Add water to the carbonate to make 

 a thin paste, pour on about half of the diluted ammonia, 

 and stir vigorously for several minutes; allow it to settle 

 and pour off the solution, leaving the undissolved salt 

 behind. Repeat this operation, using small portions of 

 the remaining ammonia water until all the carbonate is 

 dissolved, being careful to use no more ammonia than is 

 necessary to complete the solution. Then, after adding 

 the remainder of the required quantity of water, the solu- 

 tion is ready for application. 



Ammoniacal copper carbonate is a clear, light blue 

 solution, which upon drying leaves little or no stain. As a 

 fungicide it is inferior to Bordeaux mixture, and should be 

 used only as a substitute for the latter, when Bordeaux 

 mixture might discolor adjoining buildings or stain the 

 foliage of ornamental plants or maturing fruits. 



Leaf spots or leaf blights are common forms of this 

 type of disease. An ailment of this nature causes discol- 

 ored spots on the leaves, often resulting in holes and some- 

 times in the destruction and falling of the foliage. Trees 

 especially susceptible are the Walnut, Elm, Maple, Horse 

 Chestnut and Sycamore. On most trees the spots are 

 reddish brown or darker. The remedy is to collect and 

 burn fallen leaves, to destroy the spores and prevent the 

 spread of the disease, and to spray with Bordeaux mixture 

 to kill attacking spores as they start to grow. The spray 

 should be applied during the dormant season, and repeated 

 when the leaves expand, and perhaps again two or three 

 weeks later. 



Another form of leaf spots results from anthracnoses, 

 which affect the stems of young shoots as well as the 



