THE EFFECTS OF THE TREATMENT WITH FUNGICIDES ON THE PHYSIOLOGICAL PROCESSES IN PRUNUS AVIUM L. ATTACKED BY STIGMINA CARPOPHILA (LÉV.) M.B. ELLIS

Abstract

Researches regarding the effects of the treatment with fungicides on the physiological processes were carried out on Prunus avium L.,Carmen variety, cultivated in the climatic conditions in Oltenia region. Physiological research was carried out on June 26 th 2022, on cherry trees treated with the fungicide Dithane M45 (0.2%), in comparison with cherry trees attacked by Stigmina carpophila (Lév.) M.B. Ellis in which no treatments were performed. In the leaves attacked by the pathogen it was noticed that the photosynthesis intensity and transpiration intensity record lower values as a result of the effects produced by the pathogen manifested by the emergence of small pink-purple spots, bounded by a reddish-brown border, that gradually enlarges and become necrotic at the centre. The linear regressions performed between the physiological processes intensity and the photosynthetic active radiation, the leaf temperature and the stomatal conductance show a positive correlation between these. In the attacked leaves there were recorded lower values of chlorophyll content, in comparison with the leaves of plants in which fungicide treatments have been performed.