i8o 
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 
