Abstract
The effects of some grapevine virus and virus-like diseases on the performance of Vitis vinifera cv. Albana and cv. Trebbiano Romagnolo, were studied in a replicated field trial in the Emilia Romagna region (north Italy). Healthy vines were inoculated by grafting bud material from different source vines with single and multiple infections. Plant growth and yield were measured over a seven-year period, 1987 to 1993. Fruit maturity indices (°Brix, titratable acidity and pH) were measured over a six-year period, 1988 to 1993. The assessment revealed a marked influence on yield and growth of three inoculum sources (A, B, and F) which induced visible symptoms on vines. Sources A and B decreased the cumulative fruit yield by 14.2% and 72.9% (p < 0.05) in cv. Albana and 80.4% (p < 0.05) and 46.6% in cv. Trebbiano Romagnolo. Annual cumulative growth was reduced by 17.2% and 67.8% (p < 0.05) in cv. Albana and by 78.1% (p < 0.05) and 39.1% in cv. Trebbiano Romagnolo. Source F, only inoculated in the latter, induced yield and growth losses of 21.2% and 23.1%. On the contrary, when four sources (C, D, E, and G) of latent and semi-latent infectious diseases were graft-transmitted, no significant effects were observed. In general, no consistent differences in the fruit maturity indices were obtained in any of the inoculated cultivars, although, cv. Albana vines, infected with source B, showed higher sugar concentrations (significant in 5 out of 6 harvests). Moreover, the six-year weighted means for titratable acidity and pH were significantly lower (p < 0.05) in vines inoculated with source A.
- Received January 1996.
- Copyright 1997 by the American Society for Enology and Viticulture
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