Technical Report


Choosing Phylloxera-Resistant Rootstocks for Oregon Vineyards: The Impact on Vine Performance and Productivity Public Deposited

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  • Five replicated rootstock trials established in Oregon's three main viticultural. regions were evaluated for the effect of rootstock on Pinot noir performance. All the trials except Alpine included the following seven rootstocks: ungrafted Pinot noir, 3309 Couderc, 101-14 Millardet et De Grasset, 44-53 Mal6gue, 420 A Millardet et De Grasset, 5 C Teleki, and Harmony. At Alpine, the rootstock selection included ungrafted Pinot noir, 3309 Couderc, 101-14 Millardet et De Grasset, Riparia Gloire, Selection Oppenheim. 4 (SO 4) and Kober 5BB. Rootstock effect on scion performance varied greatly with site, and the responses typically were not consistent from site to site. At Newberg, Pinot noir grafted to 420 A and 44-53 had the best yields but there were no rootstock difference in must soluble solids. At Lafayette no rootstock differences in yields could be observed but soluble solids in the juice were better with 44-53. At Umpqua, the most vigorous site, no rootstock differences in yield or must soluble solids could be detected. At Eagle Point, a site with low vigor due to overcropping, yields were better when vines were grafted to 44-53 and must soluble solids was improved when grafted to 3309 C. At Alpine, with a different selection of rootstocks, yields were better when the stock was SO 4 but there was no rootstock effect on Brix.
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