114 SEVENTEENTH REPORT. 



Plot 6. 



Sprayed well until just preceding mid August when the spraying 

 Avas abandoned. 



September 1. 40% on the field everywhere, spray showing no 

 effect. 



Plot 7. 



This field was sprayed within at least three days of all rains dur- 

 ing the season. 



August 15 Scab appeared. 

 August 24 65% on nnsprayed side. 

 15% on sprayed side. 



This, like the preceding, shows fair control of the fungus. 



Plot 8. 



This was sprayed just a few hours before the Avet weather of 

 August 18 and just before all rains in August. 



August 19 Scab appeared. 

 September 5 15% on the sprayed side. 



75% on the unsprayed side. 

 September 8 No change in percentages. 



This is another example of fair control from proper timing of the 

 spray. 



Plot 11. 



This was sprayed four or five days before all the important rains 

 of mid August and the rest of the season as well. 



August 24 Scab appeared. 

 September 3 50% on the unsprayed side. 

 50% on the sprayed side. 



These results show that when the spraying occurred so that the 

 vines had little chance to make new growth before a period of 

 humid weather, they were fairly well ]>rotected. On the other 

 hand, where the spray was applied some time before the rains, the 

 vines were seriously affected on both sprayed and unsprayed portions. 



This was in particular true in August when the epidemic com- 

 menced as during the month of July there was so little rain that 

 fungous injury was almost negligible. 



