The California fruits and how to grow them; a manual of methods which have yielded greatest success, with the lists of varieties best adapted to the different districts of the state . ured. Notablesuccess has been attained in the habilitation of vineyards on the basisof resistant roots. The University Experiment Station, at Berkeley,has maintained leadership in this direction by publication of specific in-formation which can be had by application to the Director. Resistant Varieties.—American wild vines are characterized byvery marked differences in degree of resistance to phylloxera, andespec
The California fruits and how to grow them; a manual of methods which have yielded greatest success, with the lists of varieties best adapted to the different districts of the state . ured. Notablesuccess has been attained in the habilitation of vineyards on the basisof resistant roots. The University Experiment Station, at Berkeley,has maintained leadership in this direction by publication of specific in-formation which can be had by application to the Director. Resistant Varieties.—American wild vines are characterized byvery marked differences in degree of resistance to phylloxera, andespecially in adaptability to soils. Not only do species differ in thisrespect, but varieties of the same species show widely different char-acteristics. As a result of the process of selection varieties have been GRAFTING THE GRAPE 343 secured which are far above the average of the species in vigor ofgrowth and development, degree of resistance and general suitability forresistant root purposes. The few varieties which have thus demon-strated particular excellence in France and have given notable indica-tions of success in California, are presented by jNIr. Bioletti, as follows:. Methods of field grafting grape vines. A. Whip graft for stocks 1-2 to 2-3 of an inch in diameter. B, BB. Whip oraft for stocks-2-3 to 3-4 of an inclx in diameter. C, CC. Lleft 9-rait for stocks 3-4 of an inch in diameter and for old stumps. 344 CALIFORNIA FRUITS: HOW TO GROW THEM The varieties of resistant stocks which will in all probability bemost used in California are Rupestris St. George (du Lot), Riparia XRupestris 3306, Riparia X Rupestris 3309, Riparia Solonis 1616, Mour-vedreXRupestris 1202, AramonXRupestris 2, Riparia gloire, and
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