Comparative Performance of Virus-Infected Vitis vinifera cv. Savagnin rose Grafted onto Three Rootstocks

The combined effect of infection status of three Vitis vinifera cv. Savagnin rose clones and rootstock on vigor, yield, and fruit quality was determined in a replicated field trial froth 1999 to 2004. Savagnin clone 511 was infected with Grapevine leafroll-associated virus l (GLRaV-1), Grapevine virus A (GVA), Rupestris stem pitting-associated virus (RSPaV), vein mosaic, and vein necrosis (virus combination 1); clone 511A was infected with RSPaV, vein mosaic, and vein necrosis (virus combination 2); and clone 51113 was healthy. Overall, no significant interaction between infection status and rootstock genotype (Vitis rupestris, Kober 51313, or 16149 Couderc) on the viticultural performance of the three Savagnin rose clones was observed. These findings imply that there is no association between the vegetative and productive performance of scion material infected with virus combination 1 or 2 and susceptibility of Kober 51313, V. rupestris, and 161-49 Couderc to the Kober stem-grooving and rupestris stem-pitting syndromes, respectively. Nonetheless, virus combination I significantly reduced vigor (19 to 23%) and yield (42 to 54%) over six consecutive years, while virus combination 2 had no major impact on growth and production. Neither virus combination significantly affected soluble sugars or titratable acidity of fruit juice.