342 



CALIFORNIA FRUITS: HOW TO GROW THEM 



larger growth and vigor and adaptation to different California 

 soils have been secured. Notable success has been attained in 

 the habilitation of vineyards on the basis of resistant roots. The 

 University Experiment Station, at Berkeley, has maintained lead- 

 ership in this direction by publication of specific information which 

 can be had by application to the Director. 



Instances of successful herbaceous grafts. 



Resistant Varieties. American wild vines are characterized by 

 very marked differences in degree of resistance to phylloxera, and 

 especially in adaptability to soils. Not only do species differ in 

 this respect, but varieties of the same species show widely differ- 

 ent characteristics. As a result of the process of selection varieties 

 have been secured which are far above the average of the species 

 in vigor of growth and development, degree of resistance and gen- 

 eral suitability for resistant root purposes. The few varieties 

 which have thus demonstrated particular excellence in France 

 and have given notable indications of success in California, are 

 presented by Mr. Bioletti as follows : 



The varieties of resistant stocks which will in all probability 

 be most used in California are Rupestris St. George (du Lot), 

 Riparia X Rupestris 3306. Riparia X Rupestris 3309, Riparia So- 

 lonis 1616, Mourvedre X Rupestris 1202, Aramon X Rupestris 2, 

 Riparia gloire, and Riparia grande globre. These are all varieties 



