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Am. J. Enol. Vitic. 43:4:367-369 (1992)
Copyright © 1992 by the American Society for Enology and Viticulture.
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Effect of Mild Leafroll Disease on Growth, Yield, and Fruit Maturity Indices of Riesling and Zinfandel

James A. Wolpert 1 and Edward P. Vilas 1

1 Department of Viticulture and Enology, University of California, Davis, CA 95616.

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.

Key words: virus, virus-like agent

Submitted on June 11, 1991






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Copyright © 1992 by the American Society for Enology and Viticulture.