Project Number: 5358-21000-034-11
Project Type: Specific Cooperative Agreement

Start Date: Sep 26, 2003
End Date: Sep 25, 2008

Objective:
Determine effects of leaf roll disease in several Vitis vinifera L. cultivars on the following plant responses that are related to vineyard productivity and fruit quality: vegetative growth; fruit set; rates of net carbon exchange; fruit maturation; fruit quality at harvest; vine cold hardiness.

Approach:
Suspected virus-free and virus-infected vines from commercial vineyards will be selected. The virus-free Foundation Block at WSU-Prosser will be used to provide certified, virus-free vines as controls or benchmarks for the vines from commercial sites. Vegetative growth will be assessed from bud break until leaf senescence. Fruit productivity will be measured by several variables: number of clusters per vine and per shoot, percent fruit set, and berry weight. On fully expanded leaves of sentinel shoots, net photosynthesis and transpiration will be measured by infrared gas analysis. Berry samples will be collected to track ripening and fruit quality between véraison and harvest, using industry-standard indicator variables: berry weight, color, soluble solids, pH, and titratable acidity. Documents SCA with WSU. Formerly 5358-21000-025-11S (12/03).