Fig. 1. Pictures of the sampling. A, Vitis vinifera ‘Sauvignon blanc’ expressing esca leaf symptoms, from which we sampled petioles from B, symptomatic or C, asymptomatic leaves; D, wood tissues from the xylem showing a brown stripe (red arrow); different wood tissues collected from E, a trunk cross section, on which healthy wood (HW), black necrosis (BN), and white rot (WR) were visible; and 1-year-old (stems) and 2-year-old (canes) shoots that were not photographed. F, V. vinifera ‘Sauvignon blanc’ under water deficit, from which we sampled petioles from G, leaves; different wood tissues collected from H, a trunk cross section, on which HW and BN are visible, and 1-year-old (stems) and 2-year-old (canes) shoots (not photographed). Similarly, we sampled the same types of tissue from control well-watered asymptomatic plants (not shown).
Results from Pierre Gastou et al. indicate that drought increased #Ascomycota pathogen abundance in grapevine trunk but did not increase wood degradation and esca expression. Learn more: https://doi.org/10.1094/PBIOMES-07-25-0048-R
