Many actors in viticulture recognize the importance of potential quantitative relationships between susceptibility to fungal pathogens and grapevine growth or vigour. However, these relationships have been poorly documented in the literature. Some studies of grape quality have, incidentally, shown interactions between grey mould development and vegetative and reproductive growth patterns of grapevine. Our main objective was to find out which main variables characterizing canopy microclimate, grapevine vegetative and reproductive growth and fruit composition can best describe and quantify the effects on grey mould development