THE EFFECT OF SOME FUNGICIDES ON THE PHYSIOLOGICAL PROCESSES IN VITIS VINIFERA L. PLANTS ATTACKED BY GUIGNARDIA BIDWELLII (ELLIS) VIALA & RAVAZ

Researches regarding the effect of some fungicides on the physiological processes were performed on Vitis vinifera L., Cardinal variety, cultivated in the Oltenia region. The physiological analyses were carried out according to the climatic conditions on July 14th 2023 in the treated plants with the fungicide and in the attacked plants by Guignardia bidwellii (Ellis) Viala & Ravaz in which treatments with fungicide have not been performed. In the leaves of the Vitis vinifera L. plants attacked by the pathogen it was observed that the physiological processes’ intensity is lower as a result of the effects produced by the pathogen manifested by the appearance of circular spots, light brown with darker edges and then necrosis of the central portion of these spots. In the leaves of the attacked plants there were recorded lower values of chlorophyll content, compared to the leaves of the plants treated with fungicide, thus there is a positive correlation between the chlorophyll content and the intensity of photosynthesis.