Researches regarding the effect of some fungicides on the physiological processes were performed on Syringa vulgaris L. attacked by Erisiphe syringae Schwein., in Oltenia region. This causes powdery mildew, a common fungal disease on leaves, young branches, and occasionally on fruits, of various agricultural and ornamental plants. The physiological researches were carried out in the leaves of plants after treatments with fungicide and the leaves of plants attacked by the pathogen in which treatments with fungicide have not been performed. In the leaves of the plants attacked by the pathogen, in comparison with the leaves of plants after treatments with fungicide, it was observed that the physiological processes’ intensity during the day has lower values as a result of the formation of a fine mycelium felt on the surface of the leaves, under which the tissues turn brown, the leaves distortion, wilting and drying out. In the leaves of the Syringa vulgaris L. attacked by the pathogen there were recorded lower values of chlorophyll content, fact which correlates with the intensity of photosynthesis.
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