Identification of races of Meloidogyne incognita populations infecting vegetable crops of Assam
Root-knot nematodes are the most economically
important group of plant parasitic nematodes worldwide
(Sasser, 1980) attacking almost all food and fibre crops.
They are widespread and obligate sedentary endoparasites
of the roots of diversified plant species including
monocotyledonous, dicotyledonous, herbaceous and
woody plants and cause substantial yield losses, mainly
in tropical and subtropical areas. In India, root-knot
nematodes (Meloidogyne spp.) are recorded from each
and every state, particularly Meloidogyne incognita and
M. javanica have a wide distribution in northern India.
Four common root-knot species (M. incognita, M.
javanica, M. arenaria and M. hapla) account for 95 per
cent of all root-knot infestation in agricultural land, with
M. incognita being the most important species (Harman
and Sasser, 1985). Variations in host preferences of races
in a mixed population of root-knot nematode make their
identification difficult. The races of M. incognita have
not been distinguished from each other morphologically
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