2010 Annual Report 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 value. 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. 3.Progress Report In recent years, wine grape (Vitis vinifera) acreage in Idaho has expanded due to favorable climatic conditions for premium wine production. Nearly 95 percent of the total 1,215 acres of wine grapes are in the Snake River Valley appellation, with Canyon County accounting for 81% of the grape vines. The remaining 5% of Idaho wine grapes are in the Clearwater River Valley in Nez Perce and other Northern Idaho counties. However, little is known about the incidence and economic impact of Grapevine leafroll disease and other virus diseases on wine grapes in Idaho. A small-scale, initial survey conducted by three of the co-PIs in Canyon and Elmore counties in the Fall 2008 revealed multiple infestations of the Grapevine leafroll associated virus-3 in several Idaho vineyards. This finding prompted development of this comprehensive survey proposal to cover the entire state, with the overall goal to create a viable management plan to deal with virus diseases of wine grapes in the State of Idaho. Further work in 2009 showed that GLRaV-3 and grape mealybugs are present in most vineyards sampled in the Canyon County vineyards. There is a need for grower education on the importance of vector control to protect newly planted vineyards from this virus. A complementary grant from the Idaho Wine Commission is funding work on mealybug monitoring with the Idaho State Department Agriculture and virus transmission. Two in-field workshops were held for vineyard managers and owners to show symptoms of grapevine leafroll virus and mealybugs vectors in the vineyard. These workshops were well attended with more than 50% of the growers participating. There are vineyards from the early 1900’s in the Clearwater River Valley and these vineyards are being tested to determine their virus status this year as well as examined for the presence of mealybug vectors. ADODR monitoring included stakeholders meetings,lab meetings, e-mail and phone calls.