2i6 Bulletin 253. 



5. Check. 



6. Bordeaux, 5-4-40, (two applications). Ammoniacal coppef 



carbonate (three appUcations). 



7. Bordeaux (five appHcations). 



8. " (four " ). 



9. « (three " 3. 



10. Check. 



11. Bordeaux, 6-4—40. 



12. " 4-4-40. 



13. Check. 



Each plat was sprayed five times as follows : 



Niagara Grape Company H. H. Bradley 



ist. April 2istto 27th. May 12th. 



2nd. May 24th. June 22nd. 



3rd. June 6th. July loth. 



4th. July nth. Aug. 7th. 



5th. Aug. 20th. Aug. 17th. 



Probably the vines were more thoroughly sprayed than they would 

 be by the commercial vineyardist, yet not more thoroughly than would 

 be practicable for him. 



The appearance of the disease was first noticed in the vineyard of 

 the Niagara Grape Company on June 23rd, at which time it was prevalent 

 in the form of small round spots on the leaves. No trace of it was as yet 

 visible on the berries. On June 30th, it was found on the berries, which 

 at that time varied in size from that of a radish seed to a small pea. On 

 July ist, probably five per cent of the clusters on each vine showed a 

 little rot. The diseased berries were not confined to the tip, but appeared 

 on any part of the bunch. 



From this time, the disease spread very rapidly, and on July 17th 

 a very general outbreak which practically ruined the entire crop appeared. 

 Probably, there was not one bunch in a thousand that was not afiiected. 

 After July 17th, the rot spread very little, and very slowly. This con- 

 dition continued until the fruit ripened. In the vineyard of Mr. Bradley, 

 it appeared at a later date, and was less violent. 



Two methods were employed to compute the results, one based on 

 the number of the clusters, the other on the weight of the fruit. As time 

 would not permit the Experiment Station men to pick the fruit from the 

 entire plat, cross sections were selected in which conditions were as 

 uniform as possible. In the vineyard of the Niagara Grape Company 

 two sections were chosen; in the vineyard of Mr. Bradley, three. The 

 entire crop was picked from these sections, and the clusters sorted into 



