Technical Report

 

Evaluation of varieties, clones, and rootstocks: I. Evaluation of phylloxera-resistant rootstocks for the cultivars Pinot noir, Chardonnay, Pinot gris and Merlot : 1997-1998 Public Deposited

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https://ir.library.oregonstate.edu/concern/technical_reports/mg74qs830

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  • Phylloxera was discovered in Oregon in 1990 and since then there have been 26 sites confirmed as being infected with the root louse and another 10 vineyards with visible symptoms of decline where phylloxera is suspect. The presence of phylloxera is radically changing winegrape production techniques in Oregon, forcing grapegrowers to plant vines grafted to phylloxera-resistant rootstocks if vineyards are expected to have a long lifespan. Infested vineyards will need to be replanted and all the new plantings need to be on resistant rootstocks. The information presently available on the performance of vines grafted on phylloxera. resistant rootstock in Oregon is limited to Pinot noir grafted to only six rootstock selections. Affinity of winegrape cultivars to American rootstocks varies greatly with the cultivar and it is known that different varieties perform differently on the same rootstock. In the summer of 1997, a replicated trial was planted at the OSU Woodhall III Vineyard. The trial includes Pinot noir clone FPMS 2A, Chardonnay clone Dijon 95, Pinot gris clone Colmar 146, and Merlot clone FPMS 3 grafted to nine phylloxera-resistant rootstocks (and an own-rooted control). Pinot noir was grafted to an additional ten rootstock selections. Figure 1 summarizes the parentage of the rootstock selections being evaluated. This report is a brief summary of the establishment of the trial and the results to date.
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