Root-Knot Nematode


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root-knot nematode

[‚rüt ‚nät ′nēm·ə‚tōd]
(invertebrate zoology)
A plant-parasitic nematode species that induces galls or knots to form on roots.

Root-Knot Nematode

 

(Meloidogyne halpa, formerly Meloidogyne marioni), a parasitic worm of the family Tylenchidae, class Nematoda.

The root-knot nematode parasitizes on the roots of plants, causing the formation of round galls. Body length is 1.5-2 mm. The females are milk-white with bloated bodies; the males, with elongated bodies, are rarely found. Living inside the gall, the female lays about 2,000 eggs in a mucous egg sack. Microscopic larvae emerge from the eggs and infect the roots of neighboring plants or form their own galls alongside the mother’s; in this way large (to 2-3 cm) and complex galls develop. The root-knot nematode parasitizes predominantly in southern areas on the most varied hothouse, garden, melon, fruit-and-berry-bearing, and industrial crops. When it reproduces on a large scale the root-knot nematode causes gall nematodiasis in plants and frequently diminishes the harvest of a major crop (for example, cucumbers) by 40-60 percent. To combat root-knot nematodes either antinematode chemical preparations (nematocides) are used or the affected vegetable, melon, or other crop is excluded from crop rotation for two to three years.

References in periodicals archive ?
Keywords: Capparis spinosa, Clematis orientalis, Mentha longifolia, Peganum harmala, root-knot nematode, green pesticides.
Characterization of susceptibility and resistance responses to root-knot nematode (Meloidogyne incognita) infection in okra germplasm.
Southern growers may encounter ground-dwelling nematode worms, such as root-knot nematode, as well as aboveground nematodes.
Electrophoresis technique used in the study of root-knot nematode enzymes to identify species Nematologia Brasileira, v.25, n.1 p.35-44, 2001.
Root-knot nematode inoculums (Juveniles) were prepared by extracting nematode eggs from the roots of infested plants, and hatched into juveniles [32].
Among the nematodes, root-knot nematode (Meloidogyne spp.) is the most damaging under polyhouse conditions, parasitizing almost all the polyhouses crops.
enterolobii and induced cellular responses in roots of four Psidium species from the Active Germplasm Bank of the Embrapa Semiarid to guava root-knot nematode, comparing them with the susceptible commercial cultivar 'Paluma'.
Spiegel, "Nematicidal activity of essential oils and their components against the root-knot nematode," Phytopathology, vol.
Potentized Cina reduces root-knot nematode in infestation of cucumber and the antinematode effect is transmitted through water.