| Summary: | A survey of plant-parasitic nematode genera associated with certain greenhouse vegetable crops was conducted in Riyadh region, central of Saudi Arabia. In this respect, a total of 349 roots and rhizosphere soil samples were collected from the surveyed plants as follows: tomato, Solanum lycopersicum (140 samples); cucumber, Cucumis sativus (128); aubergine, Solanum melongena (25); sweet pepper, Capsicum annuum (26); green beans, Phaseolus vulgaris (22); and squash, Cucurbita pepo (8). Nematodes were extracted by centrifugal flotation and identified at the generic level using the standard identification keys. Results showed that a total of 18 plant-parasitic nematode genera were found to be associated with the six surveyed plant species. These genera, in a general descending order of occurrence frequency (FO%) were: Meloidogyne (45.8%), Aphelenchus (16.6%), Tylenchorhynchus (12.9%), Aphelenchoides (12%), Ditylenchus (10.3%), Pratylenchus (3.7%), Tylenchus (2.3%), Subanguina, Trichodorus, Tylencholaimus (1.7%, each), Hemicriconemoides (0.9%), Helicotylenchus, Longidorus, Merlinius (0.6%, each), Paratrichodorus, Paratylenchus, Telotylenchus and Zygotylenchus (0.3%, each). Identification of the root-knot nematode species revealed that M. javanica was the most common root-knot nematode infecting the surveyed greenhouse vegetable crops in general, However M. incognita was found in 2% of the examined root samples. Keywords: Frequency of occurrence, Nematodes, Population density, Prominence value, Survey
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