الفهرس 
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Abstract
An intensive survey was carried out to identify plant-parasitic nematode genera associated with the rhizospheres of Casuarina equistifolia and C. glauca trees growing in El-Montazah Park, Alexandria governorate during the period from March to December 2015. A total of 165 soil and root samples were collected for this study. Results revealed that 19 different nematode genera were found to be associated with the surveyed trees. The root-knot nematode, Meloidogyne stunt root (Tetylenchus, Tylenchorhynchus) and dagger (Xiphinema) nematodes were the most prevalent and prominent genera. They recorded frequency of occurrence (FO %) reached to 63.0, 48.5, 41.8 and 40.0%, respectively. On the other hand, buds and leaves (Aphelenchoides), fungi (Aphelenchus), stem and bulb (Ditylenchus), lance (Hoplolaimus), needle (Longidorus), ring (Mesocriconema), stubby root (Paratrichodorus, Trichodorus), pin (Paratylenchus), lesion (Pratylenchus), reniform (Rotylenchulus) and spiral (Rotylenchus) nematodes were found to be less prevalent and prominent ones recording FO ˂10%, while spiral (Helicotylenchus), sheathoid (Hemicriconemoides) and Tylenchus nematodes were rarely found (FO = 0.6%) in the rhizospheres of surveyed trees. Meloidogyne recorded the highest population density (PD) in the soil (287 second stage juveniles/kg soil), followed by Tetylenchus (PD = 249 nematodes/kg soil), whereas PD of Hoplolaimus, Mesocriconema, Paratrichodorus, Rotylenchulus, Tylenchorhynchus, Tylenchus and Xiphinema ˂ 200 nematodes/kg soil and the rest genera occurred in PD ˂ 100 nematodes/kg soil. Examination of roots associated with the collected soil samples confirmed the presence of root-knot symptoms caused by Meloidogyne and reconfirmed by isolating their adult females from roots and identified as Meloidogyne incognita