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

The present study was carried out on four olive cultivars to determine the susceptibility of each cultivar for infestation by the cotton olive psyllid, Euphyllura straminae during three successive growing seasons (2014-2016) in the Experimental Farm of City of Scientific Research and Technological Applications), Burg El-Arab area. the obtained data revealed that tophahy cultivar is the most susceptible one to infestation with E. straminae, followed by the picual cultivar, while shemlali and kalamata were less susceptible to infestation with E. straminae. By estimating the effect of cardinal directions of the grown olive trees yard on average rate of infestation for each of four inspected cultivars; it was revealed that the highest infestation was detected for the grown tophahy cultivar in the Southern direction of the yard, followed by the grown picual trees in the Northern direction; then shemlali trees in the Southern direction; and the growing kalamata trees at the Eastern side of the plantation yard.