110 



MAINE STATE COLLEGE 



The experiments made 

 by Mr. Cliester of the Del- 

 aware Experiment Station, 

 in 1891, show that the car- 

 bonate of copper and car- 

 jjgjfbonate of ammonia solu- 

 tion is cheaper, as well as 

 one of the most effective of 

 the copper compounds used 

 as fungicides. It is made 

 as follows : Mix three 

 ounces of carbonate of 

 copper with one pound of 

 pulverized carbonate of 

 ammonia ; dissolve in two 

 quarts of hot water and 

 dilute further with water to 



rig. 2. Showing beiujicial effects of spraying. fifty gallons. FigurCS 1 



and 2 show the relative condition of sprayed and unsprayed 

 trees. 



Mr. Moore made the following report : 



Jan. 3, 1893. 

 Prof. F. L. Harvey, 



Dear Sir: — ^Yours of the 27th at hand. I sprayed my pear 

 trees with the ammonia and copper carbonate solution, according 

 to directions as nearly as possible, June 13 and again July 16. 



The fungus had already appeared when the first application was 

 made, but it did not spread nor seem to kill the leaves as much as 

 the year before. The leaves remained upon the trees this year 

 until the usual time, whereas in '91 that part of the tree affected 

 was entirely bare for a month before it should have been. I think 

 the spraying has been of great benefit and will eventually cure the 

 disease. 



I thank you very much for your kindness to me, and for the 

 interest you have taken in the matter. I also wish to thank you 

 for the reports which you so kindly sent me. I have enjoyed 

 them very much and have found much in them of value to me. 



I will write you again in regard to the pear trees when the 

 leaves appear next spring. 



Yours respectfully, 



Arthur D. Moore. 



P. S. The spraying seemed to stop the disease just where it 

 was. In '91 it spread all over the leaf and seemed to burn it all 

 up, so that they were all dead by the last of August. — A. D. M. 



