114 MAINE STATE COLLEGE 



No. 1 fruit over the amount on unsprayed trees, in this case 

 amounted to nearly 65 per cent. A closer comparison of the 

 results with the different solutions is not made, because of a lack 

 of uniformity in time of application. 



The results obtained from the use of solution D — copper car- 

 bonate in suspension, will not warrant us in advising the use of 

 that mixture. Our results from the use of this mixture are 

 directly opposed to those obtained at some other experiment 

 stations. At the Central Experiment Farm of Canada, Mr. Craig 

 found the use of copper carbonate in suspension to make a differ- 

 ence of 26 per cent, in the number of fruits of the first quality, 

 while the ammoniacal solution gave an increase of only 9 percent.* 

 In our work, as will be seen from the above table, there was no 

 increase in the number of perfect fruits in the case of trees 

 sprayed with solution "D," as opposed to an increase of 43.6 per 

 cent, on trees sprayed with '-B" — the ammoniacal solution. It 

 will also be observed, that repeated applications of the mixture 

 were of no value. The per cent, of fruit entirely free from scab, 

 was actually higher on trees sprayed but once than on those 

 sprayed three times. 



The effect of the treatment with solutions A. and B was even 

 more marked in another of Mr. Pope's orchards. This orchard, 

 which has been set about forty years, is located on a hillside with 

 northwestern aspect. The orchard was used as a pasture for 

 hogs, and the trees were growing vigorously. 



Alternate rows were sprayed with solution A, the application 

 being made May 11. before the buds opened, and June 19. The 

 results were sufficiently marked so that it was possible to go into 

 the middle of the orchard and determine which were the sprayed 

 and which the unsprayed rows, from the general appearance of 

 the trees. 



Some of the trees in the check rows were sprayed May 22, 

 and June 22 with solution B, the results being nearly as satisfac- 

 tory as obtained with solution A. The fruit from four trees 

 standing in immediate proximity to each other, was counted with 

 the result shown in the table. 



* Cf. Bui. 10, Central Exp. Farm. 



