TY - JOUR T1 - Effect of Mild Leafroll Disease on Growth, Yield, and Fruit Maturity Indices of Riesling and Zinfandel JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 367 LP - 369 DO - 10.5344/ajev.1992.43.4.367 VL - 43 IS - 4 AU - James A. Wolpert AU - Edward P. Vilas Y1 - 1992/01/01 UR - http://www.ajevonline.org/content/43/4/367.abstract N2 - Effects of two isolates of mild leafroll (LR) disease on vine growth, yield components, and juice maturity indices were studied over a three year period, 1986 through 1988. LR108-infected Riesling consistently showed delayed sugar accumulation of 1 to 1.6 °Brix. In 1986, LR107-infected Zinfandel showed a 1.7 °Brix reduction compared to controls but was not significantly affected in the other two years. Juice acidity and pH of both varieties were not affected by disease infection. Vine growth and yield components showed no significant effects. ER -