The Black Rot of the Grape and Its Control. 



411 



Fig. no. — Not sprayed. Part of a tray of grapes (as they came) from Experi- 

 mental Plat No. 5 



A factor influencing total weight may be mentioned here. At dif- 

 ferent places in the section vines were missing and the number of such 

 vines differed for the different plats. An attempt was made to correct 

 the error caused by these missing vines, but it was impracticable. The 

 number of such vines on the different plats is as follows : 



Plat Number I 15 



Plat Number II 32 



Plat Number III 21 



Plat Number IV 39 



Plat Number V 12 



Plat Number VI 12 



Plat Number VII Check Rows 54 



In comparing the total yield of the different plats and check rows 

 due consideration should be given to the number of missing vines. A 

 fair average yield per vine was 25 to 30 pounds. 



It is interesting to note in this connection that a single check row 

 between two sprayed plats is not an accurate and reliable check. The 



