The influence of the climate on the evolution of diseases in the sauvignon blanc variety in the conditions of the years 2021-2022 in murfatlar

The years 2021 and 2022 evolved differently from a climatic point of view, one being particularly rainy and the other being relatively dry. During this period, through the ERA-Net MERIAVINO project, studies were carried out on the Sauvignon blanc variety treated and untreated variants with phytosanitary protection substances regarding the degree of attack on the main diseases -Downy Mildew, Powdery Mildew and Gray Rot, along with determinations regarding stomatal conductance and sensor recordings for leaf humidity. The determinations that were made showed that the climatic factors, especially the precipitation and the relative humidity of the air have an uneven distribution during the vegetation period; determine the occurrence of cryptogamic diseases and have a great influence over the rate of extension of grapevine diseases (GA). In 2021, the degree of pathogen attack was higher compared to 2022, being directly correlated with the value of leaf humidity and also, the stomatal conductance determined for 4 days immediately after the appearance of the first symptoms of Plasmopara viticola and Botrytis cinerea infections recorded decreasing values.