Current status of phytoparasitic nematodes and their host plants in Egypt.
In Egypt, phytoparasitic nematodes constitute a major constraint to agricultural production, especially in sandy soil and reclaimed desert lands. Nematological surveys were conducted to determine the genera and species of phytoparasitic nematodes on associated host plants in Egypt. Historical nematode records and survey results indicate the occurrence of 47 genera and 139 species of phytoparasitic nematodes on crops, grasses and weeds. Several of these species are reported for the first time associated with new host plants in Egypt. Important phytoparasitic nematodes include species of the citrus (Tylenchulus), cyst (Heterodera), dagger (Xiphinema), lance (Hoplolaimus), lesion (Pratylenchus), rice-root (Hirschmanniella), ring (Criconema, Mesocriconema), root-knot (Meloidogyne), spiral (Helicotylenchus) and stunt (Tylenchorhynchus) nematodes. Among these, Helicotylenchus and Meloidogyne were the most frequently encountered nematode genera.