Abstract

Grapevine trunk diseases (GTDs) are one of the most damaging phytosanitary problems in the wine industry. The main symptoms observed in the vineyard are a drastic reduction in productivity, quality, and longevity of the vines. Spatial distribution, and incidence and severity of GTDs was determined in five Cabernet Sauvignon and three Chardonnay vineyards pruned in spurs and canes, respectively. Measurements were made plant by plant and each sampling point was georeferenced using a DGPS. On the other hand, the stem water potential was determined on vines in three measurements during the season. GTDs presented an important variability at the intra-farm level mostly in Cabernet Sauvignon, and disease severity was expressed radially. The incidence of the disease in Chardonnay tended to be towards one side of the vineyards. The incidence and severity of the disease was higher in the Cabernet Sauvignon (42% of plants affected) than in Chardonnay (13% of plants affected). Cabernet Sauvignon vines were subjected to a higher level of water stress than the Chardonnay vines throughout the growing season based onto stem water potential values. We can suggest that there is varietal response to GTDs and pruning and water stress can increase the susceptibility of vines to GTDs. © 2023 by the Author(s).