Impact of grafting type on Esca foliar symptoms

• Main Authors: Séverine Mary, Coralie Laveau, Pascal Lecomte, Marc Birebent, Jean-Philippe Roby
• Format: Article
• Language: English
• Published: International Viticulture and Enology Society 2017-06-01
• Series: OENO One
• Subjects: Esca; foliar symptoms; graft type; nurseries; quality of planting material
• Online Access: https://oeno-one.eu/article/view/1408

Aim: The aim of the survey was to investigate if the grafting type influences the foliar expression of Esca during summer. Methods and Results: Observations were conducted on plots distributed in two French winegrowing regions (two different climatic regions) with two varieties (Cabernet-Sauvignon in the Bordeaux region and Mourvèdre in Provence). Three grafting types were compared: Omega graft, Whip and Tongue graft, and full cleft graft. For both varieties, we found a significant effect of the type of grafting on the foliar development of Esca symptoms. Full cleft grafted plots showed a significantly lower percentage of Esca foliar symptoms than the other two modalities, which were not significantly different from one another. Concerning Omega grafted plots, a significant difference in the rate of Esca foliar symptoms was highlighted compared to full cleft grafted plots, with a higher rate on Omega grafted plots, but these plots were also younger. Conclusions: The study established, for the first time, the difference between full cleft field grafted plots and Omega and Whip and Tongue grafted plots, revealing a higher incidence of Esca on the latter types of grafting. Significance and impact of the study: The spread of mechanical graft could be one of the factors explaining the increasing incidence of Esca in vineyard.