BULLETIN 197. 



GRAPE CULTURE IN CALIFORNIA. 



127 



Comparison of Composition of Grapes on Riparia and St. George. 



These observations warn us that we should not hastily reject the 

 Riparia as a stock. While there have been many failures on Riparia, 

 these failures can be traced to lack of selection of the proper kind 

 of Riparia and to the planting of Riparia on unsuitable soil. If we 

 plant Riparia Gloire on rich, deep, loose, moist but well-drained soil, 

 especially in the cooler districts, and avoid overbearing by too long 

 pruning, we will probably obtain better results than by planting 

 Rupestris St. George under the same conditions. 



Zinfandel. A very interesting part of the plot is a series of rows of 

 different stocks field-grafted in 1900 with Zinfandel. Each row con- 

 sisted of about 20 vines. A summary of the notes taken is given in 

 the following table : 



Notes on Zinfandel Grafted on Various Stocks. 

 Vines 5 years from grafting. 1905. St. Helena. 



It is encouraging to find that our principal wine grape has given 

 good results on all the principal stocks. The vigor and bearing of 

 the vines on Riparia X Rupestris 3309 and 101 14 were particularly fine. 



