Differential Response of Olive Cultivars to Leaf Spot Disease (Fusicladium oleagineum) under Climate Warming Conditions in Morocco

Olive leaf spot (OLS), also called olive scab and peacock eye, caused by Fusicladium oleagineum, is a major disease that causes significant damage to trees. However, we still lack information about how cultivar environmental factors influence development. In this study, evaluation of the incidence severity on twenty cultivars (Olea europaea L.), maintained in an ex situ collection Morocco, was carried out monthly during period from March July 2021. Biochemical parameters were evaluated for each including chlorophyll, polyphenols flavonoid contents. Results revealed OLS highly correlated with (r = 0.94) found be related climatic conditions cultivars. The studied classified into four groups, i.e., susceptible, moderately resistant resistant. Finally, our investigations partial relationship between resistance phenolic contents, supporting assumption potential involvement such components disease. Overall, work highlights importance characterizing driving choice best varieties effective control specific warming regions as Morocco.