126 



UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



from varieties which on their own roots require long pruning. This is 

 exemplified in table on page 124 by the fact that of eleven varieties which 

 ordinarily require long pruning eight varieties bore good . crops with 

 short pruning when grafted on Riparia ; of seven long-pruning varieties 

 grafted on St. George, only one bore good crops when pruned short. 

 This was especially noticeable with the Valdepefias and Gros Mansenc, 

 which bore very fine crops on Riparia Gloire and very little on St. 

 George. 



The only long-pruning variety which bore well on St. George was 

 the Barbera. Of the short pruning varieties the following bore well 

 on St. George: Palomino, Alicante Bouschet, Perruno, and Cornichon. 



The quality of the grapes was in nearly all cases, where a comparison 

 was possible, better on Riparia stock than on St. George. The grapes 

 were larger and sweeter. The higher sugar content was, moreover, 

 usually accompanied by higher acidity, showing that the grapes were 

 better developed. The following table includes varieties which were 

 bearing on both Riparia and St. George, and shows very clearly the 

 superiority of the former stock in regard to the quality of the must : 



Analysis of Grapes from Grafted Vines. 



St. Helena Plot. October 6, 1905. 



