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Comparative Susceptibility of Four Olive Cultivars For Infestation by The Olive Psyllid, Euphyllura straminae Longnova in Burg El-Arab Area, Alexandria, Egypt

Hassan A. Mesbah, Khadiga S. Moursi, Magda B. El-Kady, Saad H.D. Masry, Nadia M. Hassona and Yasmine A.T. Abd El-Motelb