The experience of convenient formula, a solution composed of one ounce of carbonate of copper dissolved in one quart of aqua-ammonia (strength 22 Baume), diluted with 100 quarts of water. One and one-half gallons of the diluted solution are sufficient to thoroughly spray a tree of medium size, and two gallons for one of large size. It follows, therefore, that four ounces of carbonate of copper and one gallon of ammonia will make 100 gallons of the diluted solution, which is sufficient to spray 50 large or about 75 medium trees once." "How to Make and Apply the Fungicide. The ammonia should be procured in a glass or earthern vessel, and be kept tightly corked with a rubber stopper. To this add the precipitated carbonate of copper at the rate of one ounce to one quart of ammonia, in which it dissolves, forming a very clear, deep blue liquid. When ready to commence the application, add this solution to the water used for spraying, at the rate of one quart to twenty-five gallons of water. The bottle containing the solution should be kept tightly corked, otherwise the ammonia will waste by evaporation. The number of applications it is necessary to make to secure the greatest benefit is yet to be determined.

The adhesive power of the carbonate of copper is very great, and it is possible that a smaller number of treatments than the seven made in our experiment would have answered as well. I would recommend at least three or four treatments, and it is probable that one application, made just after the leaves expand and before the flowers have opened, would add to the efficiency of the treatment, as the fungus commences its growth quite early in the season." Bulletin No. 59, Michigan Experiment Station.

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