2i8 Bulletin 253. 



Deductions front the experiments of igo6 



1 . Unsprayed rows yielded no marketable fruit. 



2. No striking differences were shown by the different sprays, 



3 . The addition of sulphur did not increase the efficiency of the spray 

 to a noticeable degree. 



4. The best results were secured with Bordeaux, 5-4-40, -f sulphur 

 2 lbs. to 40 gals. 



5. Spraying after the rot appeared apparently did not affect its 

 spread. 



6. The foliage was much healthier and freer from disease on the 

 sprayed rows. 



7. The rot was worse on fruit in the immediate vicinity of dried 

 clusters of previous years. This emphasizes the necessity of removing 

 all dried clusters or other means by which the disease may be 

 carried over winter. 



8. A normal yield for one row in the vineyard of the Niagara Grape 

 Company approximated 400 pounds. The largest yield from any sprayed 

 row in the same vineyard amounted to 132 pounds. This represented a 

 loss of sixty-seven per cent caused by the rot, or a saving of thirty-three 

 per cent caused by the spraying. While this is unsatisfactory from the 

 standpoint of effective protection, yet the thirty-three per cent, saved 

 much more than paid for the operation. It is a question, however, if 

 grape-growing could be conducted with profit on this basis, counting 

 expenses and interest on investment. 



On the other hand, in the vineyard of Mr. H. H. Bradley, fully 

 eighty per cent of the crop was saved, the loss amounting to about 

 twenty per cent only. Spraying, therefore, with Mr. Bradley proved of 

 great commercial value. 



Experiments of 1907. 



The work of 1906 showed marked results in favor of spraying. The 

 experimenters, however, did not feel that the problem was solved for the 

 commercial grower. Work on a larger scale must be done, and the re- 

 sults computed from the standpoint of the grower. Such work was 

 undertaken in the year 1907, A plat of ten acres was chosen in the vine- 

 yard of the Niagara Grape Company. The experiment was planned and 

 conducted with the greatest care consistent with the scale on wiiich the 

 work was carried out. If the rot could be controlled by spraying, 

 the experimenters were determined to control it. The map shows 

 the general plan of the work. 



