Study Grenache declines in mediterranean aera

Keywords : Grenache,110R, mortality, yield, trunk diseases

« DEP GRENACHE » project is dedicated to study decline problems of cultivar Grenache in its most planted area in France, south-eastern Mediterranean vineyards. Grenache cultivar is very important for most grape growing “appellations” in this area where it is anciently settled, first planted cultivar and the second most planted one in France. Although it is frequently assumed to show little susceptibility to foliar symptoms of esca compared to other cultivars, it shows a substantial level of mortality and decline which, along with its importance for typicity of Mediterranean wines, are the starting point of this project. Thanks to 6 partners grouped around the IFV institute, “DEP GRENACHE” project will work on 3 directions: (i) global approach of its decline prevalence and causes, (ii) more specific work on trunk diseases susceptibility and (iii) evaluation of the efficacy of practical solutions for growers like trunk renewal, trunk cleaning (“curetage” method), pruning practices and systems. In addition, a part of the work will also be dedicated to investigate rootstock 110R decline problems, as reported by many nurseries in SE France and Grenache most grafted on rootstock. This project is set for 3.5 years, from 2020 to 2024.

Partners

Led by Marion Claverie from IFV, in partnership with 4 "chambres d'agriculture" (Vaucluse, Drôme, Gard, Bouches-du-Rhône) and syndicat général des vignerons des Côtes du Rhône.

Actions

• Action 1: Global approach of Grenache decline prevalence and causes
• Action 2: evaluation of trunk diseases susceptibility
• Action 3: Evaluation of the efficacy of practical solutions for growers like trunk renewal, trunk cleaning (“curetage” method), pruning practices and systems

Timetable

The project is planned to last three years, from April 2020.