Impact of grafting type on Esca foliar symptoms

• Mary Séverine ^[1] ; Laveau Coralie ^[1] ; Lecomte Pascal ^[1] ; Birebent Marc ^[2] ; Roby Jean-Philippe ^[1]
  1. [1] Univ. Bordeaux
  2. [2] Worldwide Vineyards
• Localización: OENO ONE: Journal international des sciences de la vigne et du vin = International journal of vine and wine sciences, ISSN 1151-0285, Vol. 51, Nº 2, 2017, págs. 221-230
• Idioma: inglés
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• Resumen

  • 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.