510 Eepokt of tiif, DKrAiriMKA-T OF TToirru'ui/rin.'K of the 



proper comparisons of yields could Lo made. Early in the life of 

 the experiment the enormous death rate of the vines, as set forth 

 in the annual reports, \'itiated any data to be had, l)ecause of the 

 differences in the ages of the plants, differences which became less 

 marked as all vines came into full bearing. When a sufficient 

 number of the vines came to an age and to a size v^here their 

 products could be somewhat accurately compared, fidia and hail- 

 storms all but ruined several crops. The data, then, to prove 

 greater productiveness of the grafted vines will not bear critical 

 analysis and are chiefly valuable because they substantiate the 

 impressions of all who have worked with the experiment. 



Table II shows that all grafted vines are more productive than 

 those on their own roots. The figures in this table seem to show 

 that the varieties on Clevener stocks are most productive, those on 

 Gloire next, the varieties on St. George are third most productive 

 and those on their own roots are least productive. The following 

 is a summary: The average number of pounds per vine for the 

 four groups of stocks are: own roots, 7.6; St. George, 10; Gloire, 



Table II. — Average Yield Per Vine of Own-root and Grafted Grape 



Varieties, 190S-1909-1911. 



Variety. 



Own 

 roots. 



St. 

 George. 



Gloire. 



Clev- 

 ener. 



Niagara. . 

 Vergennes . 

 Campbell. 

 Concord. . 

 Regal .... 

 Catawba. . 

 Brighton. . 

 Barry .... 

 Lindley . . . 

 Agawam . . 

 Winchell . . 

 Worden. . 



Mills 



Herbert. . 

 loua 



Lbs. 

 8.8 

 9.6 

 4.4 



12.3 

 6.7 



10.6 

 7.1 



10.3 

 6.9 

 7.2 

 6.5 

 5.1 



8.2 

 3.5 



Lbs. 

 14.7 

 12.6 

 13.0 



13 



8 

 11 



6 



7 



7.9 

 10.5 

 10.7 



7.3 

 11.4 



9.2 



7.9 



Lbs. 

 15.4 

 15.5 

 13.9 

 14.1 



7.2 

 13.6 



7.0 

 11.2 



8.0 



9.3 

 11.8 



9.3 

 11.5 

 11.5 



9.2 



Lbs. 

 13.2 

 16.1 



8.2 

 13.8 

 10. 

 13. 

 10.0 

 11.8 

 14. 



8. 



.4 

 1 



1 

 .4 



