714 



$560.90; the cost of spraying was $27.80. leaving a net income of 

 $533.10. 



Details of the experiment are given in notes and tables, and the 

 results are thus summed up: 



(1) As a result of two years' treatment in a vineyard previously well-nigh rniued 

 through the ravages of black rot, the yield has been raised to the normal of 8.47 

 pounds per vine, and the percentage of rot reduced to about one half of 1 per cent. 



(2) The net income per vine was 75 cents, and the cost of treatment 3 cents, leav- 

 ing a net b.alance of 72 cents per vine. 



(3) A few check unsprayed rows left between a majority of others which are sprayed 

 fail to become a measure of the loss in an untreated vineyard. 



Experiments near New Castle. — These were on Champion grapes in 

 the vineyard of Dr. J. J. Black. The fungicides used were ammoniacal 

 carbonate of copper, carbonate of copper and carbonate of ammonia 

 mixture, precipitated carbonate of copper, and Bordeaux mixture. A 

 diagram illustrates the location of the sections of the vineyard where 

 the different fungicides were used. Anthracuose was the prevailing 

 disease, but there was also a certain amount of black rot. April 12 a 

 part of the vines were sprayed with a solution of sulphate of copper 

 (1 pound to 20 gallons of water). Five applications of the different 

 fungicides were made between May 17 and July 18. " The last appli- 

 cation to vines sprayed with the Bordeaux mixture was made with the 

 carbonate of copper and carbonate of ammonia mixture. As a result, 

 it was not found necessary to wash any of the fruit at harvest." One day 

 previous to harvesting the crop the diseased berries were picked and 

 weighed. A table shows the results for each kind of treatment. The 

 percentage of diseased fruit varied from 29.2 on the unsprayed vines to 

 1.9 where the Bordeaux mixture was heavily applied ; the yield per vine 

 ranged from 1.12 pounds for the unsprayed vines to 4.5 pounds where 

 the Bordeaux mixture was heavily applied. The results of the experi- 

 ment may be summed up as follows : 



(1) The winter treatment of these vines with sulphate of copper has been highly 

 beneficial, the percentage of diseased fruit beiug nearly twice as great on vines which 

 did not receive this treatment as on those which did, while the yield by the winter 

 treatment was increased about 1 pound to the vine. 



(2) In this experiment the ammoniacal carbonate of copper has not given satisfac- 

 tory results. 



(3) The carbonate of copper and carbonate of ammonia mixture, combined with 

 the winter treatment [was cheaper and more efiectivej, « * * yet it is question- 

 able whether even this mixture is to be generally recommended. 



(4) The precipitated carbonate of copper is nearly as effectual in preventing rot 

 end anthracuose as the Bordeaux mixture, and on account of its cheapness promises 

 much. 



(5) The Bordeaux mixture has produced the best results ; not only by diminishing 

 the rot and anthracuose, but by apparently stimulating the growth and vigor of the 

 vines. 



(6) According to this experiment a light spraying of the Bordeaux mixture is 

 nearly as oflfectual as a heavy spraying. 



