Grape Variety: Souzão

Variety Name	Souzão
TTB Approved Name(s)	Souzão
Common Synonyms	Sousão, Vinhão
All Synonyms	Sousão, Sousão de Correr, Sousão Forte, Vinhão
Countries of Origin	Portugal
Species	Vitis vinifera
References	Show 3 references Hide references Robinson, J. 2006. The Oxford Companion to Wine. Third edition. Oxford University Press. Vitis International Variety Catalogue (VIVC). Federal Centre for Breeding Research on Cultivated Plants (BAZ). Institute for Grapevine Breeding Geilweilerhof (IRZ). August, 2007. Link The former National Grape Registry (NGR) was initially compiled and annotated using the earlier version of the Vitis database. The VIVC underwent a significant update beginning in 2007. Corresponding updates to this Registry will be made as necessary. Alcohol and Tobacco Tax and Trade Bureau (TTB). Code of Federal Regulations Title 27 Part 4.91 List of approved prime names. Link
Berry Color	Black
Uses	Wine
Comments	This grape is high in acidity and color and is suitable for port-style wines.

Souzão Selections

	Souzão [01]
Registration Status	Registered
Source	Department of Viticulture & Enology, UC Davis
Comments	This selection came to Foundation Plant Services around 1960 from the vineyard of the Department of Viticulture & Enology, UC Davis (location I75 v9). The original material underwent heat treatment therapy for 81 days and completed basic index testing, after which it was planted in the old foundation vineyard in 1966 as Souzão 01. Souzão 01 underwent microshoot tip tissue culture therapy at FPS in 2011 to qualify for the Russell Ranch Foundation Vineyard. The treated material successfully completed testing in 2013 and will be planted at Russell Ranch as Souzão FPS 01.1.
	Souzão [02.2]
Registration Status	Registered
Source	Portugal
Comments	This selection was imported to Davis in 1984 by Dr. Harold Olmo (Professor, UC Davis) from the Regua Agricultural Station in the Douro region of Portugal. The original material was named Souzão II and was infected with leafroll virus. The selection underwent microshoot tip tissue culture therapy at FPS in 2007 and successfully completed testing to qualify for the Russell Ranch Foundation Vineyard in 2013.