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Description
Freedom, Couderc 1613, Dogridge, Salt Creek, and Harmony rootstock rootings were planted adjacent to existing Carnelian vines in a clay loam soil with a documented phylloxera population in the CSU, Fresno Campus vineyard in 1979. Rootstocks were allowed to grow during the 1979 and 1980 seasons. In 1981, rootstocks with sufficient cane diameter (minimum diameter = 6.4 mm) were inarch grafted into the base of the Carnelian vine trunks. Selected inarch-grafted vines in the Freedom plot were severed from their own roots in 1983, prior to bud burst. The trunk of the mother vines were cut approximately 5 cm below the inarch graft union. Severance of own roots is an additional cost in the inarch grafting procedure. It would be advantageous to growers if this process was unnecessary. Initial data collected in 1984 suggested no negative effects on vine growth and yield when own roots were retained. The purpose of this experiment was to further investigate the influence of severance of own roots on inarch-grafted vines under equilibrium conditions (beginning 7 years after trunks were severed). Carnelian vines inarch-grafted with Freedom rootstock were used in this experiment. Vines with own roots severed, vines with own roots retained, and vines which were not inarch-grafted (control) were identified. Eight single vine replicates were selected using a completely randomized experimental design. Yield, pruning weight, and fruit composition data were collected during the 1990 and 1991 seasons. Data were subjected to analysis of variance and mean separation was by Duncan's Multiple Range Test.
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