T he wine grape, Vitis vinifera, is a member of the Vitaceae, a family of vigorous, climbing, woody plants that live in the Northern Hemisphere. The plants are illadapted to tropical climates, and thus never crossed the equator (except those transported by humans, which are cultivated in Argentina, Chile, Australia, South Africa, and other regions in the Southern Hemisphere). The genus Vitis co...

A survey was conducted to determine the quality and yield of 15 major wine grape cultivars. Six Vitis vinifera L., three Vitis rotundifolia Michx., and six French-American hybrid cultivars were included in the survey. Fruit maturation was determined by percent soluble solids, TA, and pH measurements. Soluble solids were attained at the expense of acidity and pH. In spite of low soluble solids a...

Crop protection strategies based on cupric products and mainly adopted in organic viticulture produce a consistent environmental impact due to the persistence of copper soils its negative effects edaphic biodiversity. In this work, trials were carried out during crop years 2018–2020 vineyard with an management by low-copper strategy conventional IPM reduced use fungicides. Phytosanitary treatme...

Berry diameter was monitored during dry-down and rewatering cycles and pressurization of the root system of Vitis vinifera (cv. Merlot) and Vitis labruscana (cv. Concord) to test changes in xylem functionality during grape ripening. Prior to veraison (onset of ripening), berries maintained their size under declining soil moisture until the plants had used 80% of the transpirable soil water, beg...

Grapevine red blotch disease (GRBD) is an emerging caused by grapevine virus (GRBV). It widespread in most United States winegrape production regions and differential spread dynamics have been reported between the regions. This study surveyed eight vineyard sites southern Oregon over four years for progression of GRBD incidence. The vineyards included five that were or older three three-years-o...

Grape berry composition mainly consists of primary and secondary metabolites. Both are sensitive to environment and viticultural management. As a consequence, climate change can affect berry composition and modify wine quality and typicity. Leaf removal techniques can impact berry composition by modulating the source-to-sink balance and, in turn, may mitigate some undesired effects due to clima...