Technical Report


Cooperative Rootstock Trials: Research Update 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 Malegue, 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 had the best yields and ungrafted vines, the lowest. Vines grafted to 101-14 had the highest must soluble solids. At Lafayette, no rootstock differences in soluble solids in the juice could be observed but yields were better with 3309 C. At Umpqua, the most vigorous site, vines grafted to 45-53 had the best yields and when grafted to 101-14 had the lowest fruit production. There was no difference on must soluble solids at this site. At Eagle Point, a site with very shallow soil and low vigor, yields were better when vines were grafted to 3309 C and lower when grafted to Harmony or 5C. Must soluble solids did not respond to rootstock. 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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