Technical Report
 

Summary of Report on the 17th International Symposium for Grape Propagation and Geisenheim Research Center February 4-8, 1985

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  • In the interest of taking full advantage of a personal business trip to Frankfurt, West Germany to attend the 17th International Symposium for Grape Propagation, I offered to make contacts for the Wine Advisory Board. I was asked to focus and report on five topics of research interest to OSU and the Wine Advisory Board. A summary follows: 1.Top Working: Two conflicting factors contribute to the assessment of the potential for efficient and economical field grafting in cool climate viticultural areas. First, it is already well recognized that successful field grafting is much easier to achieve in southern climes (e.g. Italy, or California). The synchronization of the critical stage in Spring growth with required callusing temperature conditions necessary to assure "a take" is much more reliable in warmer and drier viticultural areas. Unfortunately, I have been unable to find any research thus far which quantifies the bounds of constraint for successful field grafting. That brings us to the second factor which makes this problem difficult to assess. The entire German wine grape propagation system which has become institutionalized by laws over the past one hundred years is dependent upon well regulated bench grafting practices. Any mention or thought of field grafting runs counter to well ingrained tradition. So it appears that we, in Oregon, will have to seek out our own solutions on the feasibility of changing varieties in the field. What we know thus far is that successful field grafting is erratic while bench grafting is reliable in Oregon. More research and experience in field grafting may provide greater dependability in the future. 2.Rootstocks: The word from Geisenheim is that they gave up on AXR before WWI. California has used it with some success but it has changed unrecognizably from its original clonal form. They do not recommend its use in cool climates. Oppenheim S04 continues to be the mainstay particularly for combining Phylloxera resistance with reduced vigor. The rest of the rootstocks intended for special conditions or experimental work which show some promise include Couderc 1202 and 3309, Richter 99, 5BB and 5C. Unfortunately, I was unable to communicate adequately with the Bulgarians to learn anything. Richter 99 continues to be a mainstay in South Africa where Phylloxera is a serious problem. As with field grafting, much work will be needed here in Oregon before any definitive recommendations can be offered. 3.Vigor Control: No major, new informational breakthroughs were learned at Geisenheim or the international symposium on this subject.
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