218 



THE GRAPE 



Clean culture and thorough spraying will control this 

 disease to a large degree. The 4—1-50 Bordeaux mixture is 

 the most effective, and the first application should be given 

 about the time the young shoots are a foot long. The spray- 

 ing should be continued throughout the summer at intervals 



Fig. 100.- 



-Black rot of the Niagara grape. (After Reddick, Cornell Bulletin 

 No. 293.) 



of two or three weeks until five or six sprayings ha^■e been 

 given. The number of sprayings that will be required will 

 depend largely upon the weather conditions. In regions 

 where the rain fall is abundant more spra>'ing will be 

 necessar\'. 



