Abstract
Based on the worldwide survey carried out by Sasser and Freckman (1987), the root-knot nematode (Meloidogyne) was ranked as number one out of the ten most important phytoparasitic nematode genera (Meloidogyne and Pratylenchus, the lesion nematode; Ditylenchus, the stem and bulb nematode; Globodera and Heterodera, the cyst nematodes; Tylenchulus, the citrus nematode; Xiphinema, the dagger nematode; Radopholus, the burrowing nematode; Rotylenchulus, the reniform nematode; and Helicotylenchus, the spiral nematode) with wide geographical distribution (Sasser, 1989), phytophagous food habit and infecting over 2200 plant species. It consists of more than 63 species. Out of them, M. incognita, M. javanica, M. arenaria and M. hapla are the most commonly occurring and devastating species in various agricultural crops. The first three species are mainly distributed in the tropical and the subtropical zones (between 35° S and 35° N latitudes) while M. hapla is found in the cold climate areas of the world (Sasser, 1977).
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