iUO RkI'OIIT ok TilK DEl'Ain'MKNT OF lIoKTU'lTLTT'lJK OF THE 



The winter of 1903-04 was unusually severe and many more vines 

 were either killed or so severely injured that they died during 

 the next two years. The vines on St. George, a very deep-rooting 

 grape, withstood the cold best. Fidia, the grape root-worm, was 

 found in the vineyards early in the life of the vines and did much 

 damage in some years. In the years of 1907 and 1909 the crops 

 were ruined by hail. 



But despite these serious setbacks it was evident throughout 

 the experiment that the grafted grapes were better vines. And 

 so, though the experiment is a partial failure through accidents, 

 the results are thought to be worth publishing. 



Tables II and III show that the grafted grapes are more pro- 

 ductive than those on their own roots. As an example of the 

 differences in yield, a summary of the data for 191 1 from Table 

 III may be given, In this year, an average of all the varieties 

 lOn own roots yielded at the rate of 4.39 tons per acre ; on St. 

 George, 5.36 tons; on Gloire, 5.32 tons; on Clevener, 5.62 tons. 

 The crops on the grafted vines were increased through the setting 

 of more bunches and the development of larger bunches and 

 berries. 



The grapes on the grafted vines ripen a few days earlier than 

 those on their own roots. This holds, in particular, as regards 

 Gloire and Clevener, while with St. George a few varieties were 

 retarded in ripening. Time of maturity is very important in 

 this region, where there is danger of early frost to late ripening 

 sorts and where it is often desirable to retard the harvest time 

 of early grapes. 



In the behavior of the vines the results correspond closely with 

 those given for yields. In the relative growth ratings of varieties 

 on different stocks the varieties on their own roots were rated in 

 vigor at 40 ; on St. George, at 63.2 ; on Gloire, at 65.2 ; on Clevener, 

 at 67.9. There is no way of deciding how muck the thrift of the 

 vines depends on adaptability to soil and how much on other 

 factors. Since all of the varieties were more productive and 

 vigorous on grafted vines than on their ov/n roots, it may be 

 said that a high degree of congeniality exists between the stocks 

 and varieties under test. 



The experiment suggests that it would be profitable to grow 

 some of the fancy grapes of the region on grafted vines and that 



