Harmonising grapevine phenology recording for budburst and flowering as recommended by the Perpheclim project
Harmonisation des notations de débourrement et de floraison selon les recommandations du projet perpheclim
Résumé
In the framework of a French network of researchers working on the phenology of forest trees, fruit trees and grapevine (PERPHECLIM ACCAF project), methods of observations and sampling strategies were discussed and compared. The objective was a harmonisation of data acquisition strategies for grapevine phenology. The BBCH scale was chosen as a reference because it is the most detailed phenological scale available. However, when possible, correspondences to the widely used Baggiolini and modified Eichhorn and Lorenz scales are provided. Budburst is considered when 50% of the buds reach BBCH 07 and flowering when 50% of flowers are open (BBCH 65). Two ways of counting were compared: assessment of the percentage of open flowers inflorescence by inflorescence versus a global recording on whole plants. Visual estimations of flowering percentage for inflorescences were compared to exact counts of open flowers. In order to facilitate comparisons of phenological data, we propose standardised
protocols, both for observation methodology as for sampling strategy, for assessing budburst and flowering dates.
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