80 STATE POMOLOGICAL SOCIETY. 



For several seasons past, experiments have been conducted in 

 various states for the purpose of determining a successful method of 

 combatting the disease. It has been found that in many instances 

 great benefit is derived from the use of some of the compounds of 

 copper in solution. 



During the past season a series of experiments was planned with 

 the purpose of determining on an extended scale, the effectiveness 

 of certain mixtures, and some of the problems relative to methods 

 of application. The latter portion of the work was carried on 

 largely in the orchard of F. M. Woodward of Winthrop, the work 

 being conducted by Mr. C. E. Moore. Owing to local conditions, 

 most of the problems relating to methods of application remain 

 unsolved. Though much credit is due Mr. Moore tor the faithful- 

 ness with which he attended to the spraying. 



In regard to the effectiveness of spraying with copper compounds 

 in checking the apple scab, results were eminently satisfactory. In 

 the orchards of our President, Mr Pope of Manchester, fifty nine 

 trees were sprayed with various mixtures and a suitable number of 

 trees were left without treatment to serve as checks. The trees 

 were of medium size, and bore from one to three barrels of fruit. 

 The time at command was so limited, that not all of the trees could 

 be examined criticall3\ But a sufficient number was examined to 

 give a good basis for our conclusions. Four different mixtures 

 were used : 



A. A modified form of eau celeste^ made by dissolving two pounds 

 sulphate of copper ("Blue stone"), and two pints strong ammonia, 

 and for use diluting to twenty-eight gallons. 



B. Ammonio-copper carbonate solution — three ounces carbonate 

 of copper dissolved in one quart ammonia. Diluted to thirty gal- 

 lons for use. 



C. The same as B, except that only two ounces of copper was 

 used. 



D. Carbonate of copper in suspension. Two ounces carbonate 

 of copper placed in twentj'-five gallons of water. 



Table IV gives the average results obtained from the examination 

 of several trees sprayed with each solution, and of the un8pra3'ed 

 trees. 



