TY - JOUR T1 - Effect of Viroids on Growth, Yield, and Maturity Indices of Cabernet Sauvignon Grapevines JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 21 LP - 24 DO - 10.5344/ajev.1996.47.1.21 VL - 47 IS - 1 AU - J. A. Wolpert AU - J. A Szychowski AU - J. S. Semancik Y1 - 1996/01/01 UR - http://www.ajevonline.org/content/47/1/21.abstract N2 - 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." ER -