. California fruits and how to grow them. Fruit culture. How to Grow Them 239 Resistant Varieties but not wet enough to cause decay, as has already been described in the keeping of cuttings. Time op Grafting.—Grafting into old vine stumps is done in February, March, and April in different parts of the State, March being the month usually chosen for the work. If a spring graft fails, the stump may be re- grafted in August or in the following spring. In regrafting, the stump is cut off again be- low the previous cleft. The time for the work lication of specific information which can be had by ap
. California fruits and how to grow them. Fruit culture. How to Grow Them 239 Resistant Varieties but not wet enough to cause decay, as has already been described in the keeping of cuttings. Time op Grafting.—Grafting into old vine stumps is done in February, March, and April in different parts of the State, March being the month usually chosen for the work. If a spring graft fails, the stump may be re- grafted in August or in the following spring. In regrafting, the stump is cut off again be- low the previous cleft. The time for the work lication of specific information which can be had by application to the Director. Resistant Varibties.—American wild vines are characterized by very marked differences in degree of resistance to phyllox- era, and especially in adaptability to soils. Not only do species differ in this respect, but varieties of the same species show widely different characteristics. As a result of the process of selection varieties have been se- cured which are far above the average of the. Instances of successful herbaceous grafts. is when the sap has ceased flowing, usually from the first to the tenth of August. The recourse to resistant roots to escape the phylloxera has been attended with some disappointment because the wild roots at first widely used proved only partially re- sistant. Recently, in the main through em- ployment of French selected varieties of the American wild species, stocks with satis- factory resistance, 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 main- tained leadership in this direction by pub- species in vigor of growth and development, degree of resistance and general suitability for resistant root purposes. The few varieties which have thus demonstrated particular excellence in France and have given notable indications of suc
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