866 Popular Editions of Station Bulletins of the 



this year alone correspond very closely to the judgment of the 

 observers from general behavior of the vines and might be taken 

 as an index of the trend of the experiment. They point in the 

 same direction as the figures from the averages of the three crops. 

 The yields in this year were, for varieties on their own roots 

 4.4 tons per acre, on St. George roots 5.4 tons, on Gloire 5.3 tons, 

 and on Clevener 5.6 tons. The data are too few and scatterino; to 

 attempt comparisons variety by variety either in productivity, 

 resistance to insects or diseases, or except in a general way in 

 adaptability of cions to stocks. 



However, it was very plain to those who 

 Grafted vines studied the vineyard that the grafted 

 more vines were more vigorous than those not 



vigorous. grafted. In an attempt to bring out this 



point, the vigor of vines was carefully rated 

 in one season. Early in 1910, when the vineyard had reached 

 bearing age, when insects and fungi were well under control and 

 before the hailstorm of that year ruined the crop, careful esti- 

 mates gave varieties on their o'wti roots an average rating of 40 

 per ct. of perfect vigor, those on St. George 63.2 per ct., those 

 on Gloire 65.2 and those on Clevener 67.9 per ct. As already 

 stated, it would be unfair to make strict varietal comparsions in 

 this regard, but the better behavior of nearly all the varieties on 

 all three of the stocks proves these stocks congenial for union 

 with our varieties and speaks in favor of their use in future w^ork 

 along this line. Xo variety on its own roots reached an average 

 of 70 per ct. of what might be expected, but on Gloire roots, 

 Concord, Herbert, and Lindley reached averages of more than 75 

 per ct. ; on St. George roots. Concord, Herbert, Xiagara, and 

 Vergennes all exceeded this average; while on Clevener roots 

 Barry, Brighton, Catawba, Delaware, Lindley, Regal, and Ver- 

 gennes proved far better than on their own roots. 



While one of the principal objects of the 



Resistance to experiment was to test the effect of grafting 



insects and upon resistance to insects and diseases, the 



diseases. work has really furnished no satisfactory 



evidence along these lines. The mishaps 



during the early years of the test made so unequal the numbers of 



