1a.Objectives (from AD-416)
The objective of this cooperative research project is to conduct collaborative
viticulture research of mutual benefit to ARS and the University of Idaho. The
research conducted by the University of Idaho will be complementary to the wine
grape research program established by ARS at the University of Idaho’s Parma
Research and Extension Center. The broad objective of the ARS program is to
investigate integrated, sustainable production practices for development of improved vineyard management strategies and improved end product quality or perceived market
1b.Approach (from AD-416)
Investigate critical management and production practices impacting wine grape
quality components. Emphasis will be placed on water and canopy management, endproduct processing methods, as well as germplasm evaluation. Documents SCA with U of ID - Parma. Formerly 5358-21000-034-15S (12/2008). Formerly 5358-21000-041-01S (9/2009). Congressionally mandated.
This research relates to objective 1 of the parent project. Grapevine samples were collected from the Lewiston area and the Caldwell areas of Idaho. In Lewiston very few Grapevine leafroll associated viruses (GLRaVs) were detected, while in the Caldwell area, where most grapes in Idaho are grown, a high incidence of GLRaVs was observed. In addition, many vineyards in the Caldwell area had high populations of the grape mealybug, a vector of GLRaVs in the vineyards. Table grapes were noted as having wider spectrum of grapevine viruses, including those from the rugose wood complex which were not commonly found in wine grapes in Idaho and could potentially serve as a source of inoculum for these viruses into wine grapes. This information has been presented to growers at field days and winter meetings. We continue to make progress on our collaborative research on critical management and production practices (grapevine leafroll associated virus, irrigation, etc.) impacting wine grape components. Project monitoring included stakeholders meetings, lab meetings, e-mails, and phone calls.