PT  - JOURNAL ARTICLE
AU  - J. A. Wolpert
AU  - J. A Szychowski
AU  - J. S. Semancik
TI  - Effect of Viroids on Growth, Yield, and Maturity Indices of Cabernet Sauvignon Grapevines
AID  - 10.5344/ajev.1996.47.1.21
DP  - 1996 Jan 01
TA  - American Journal of Enology and Viticulture
PG  - 21--24
VI  - 47
IP  - 1
4099  - http://www.ajevonline.org/content/47/1/21.short
4100  - http://www.ajevonline.org/content/47/1/21.full
SO  - Am J Enol Vitic.1996 Jan 01; 47
AB  - The effect of viroids was tested by comparing shoot tip cultured (STC), viroid-free Cabernet Sauvignon to STC vines reinoculated with two grapevine yellow speckle viroids (GYSVd-1 and GYSVd-2) and hop stunt viroid (HSVd-g), and to a commercial selection of Cabernet Sauvignon. Growth and yield components were measured over a three year-period (1991-1993) on mature vines in the Napa Valley. On average, vegetative growth was greater on STC vines as a result of heavier shoots. Viroids did not affect yield components but fruit of STC vines was higher in titratable acidity and lower in pH than STC + viroids. In these own-rooted vines, viroids do not cause recognizable "disease."