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 ?
The avermectins are streptomycete-derived macrocyclic lactones that have high potencies against insect pests in several orders, phytophagous mites, and the plantparasitic nematode Meloidogyne incognita (Tylenchida: Meloidogynidae) (Ishaaya & Horowitz 1998).
Juvenile hatching of Meloidogyne incognita was also greatly inhibited by the extracts.
Nagaraju M, Karemegam N, Kadalmani B (2010) Eco-friendly management of root-knot nematode Meloidogyne incognita using organic amendments on tomato.
A system involving incorporating mustard green manures to replace conventional metham sodium treatment in potato fields has provided adequate management of pathogens that cause diseases like Verticillium, Sclerotinia, Helminthosporium, and Meloidogyne [10].
In this Indian study from the Department of Zoology, VisvaBharati University, researchers set out to determine the effects of homoeopathically potentized Artemisia nilagirica Extract (Cina) soaked globules on root-knot disease caused by Meloidogyne incognita in mulberry (Morus alba L.
No Brasil, os nematoides formadores de galhas pertencentes ao genero Meloidogyne Goeldi sao considerados um dos principais responsaveis pela baixa produtividade na cultura do feijoeiro.
Anti-nematicidal activity has been reported for both ursolic and pomolic acids (the latter also being present in Bignoniaceae family plants) against root-knot nematode Meloidogyne incognita (Begum et al.
Dentre os nematoides-chave na cultura da soja, encontram-se os nematoides de galha Meloidogyne incognita (Kofoid e White) Chitwood e M.
Initial comparative genomic analysis was made with Meloidogyne incognita genome, Caenohabditis elegans genome, RN Expressed Sequence Tags (ESTs), RN 18S variants, and other nematode ESTs for sequence similarities.
The most prevalent root-knot nematode species, Meloidogyne arenaria, is present in about 41% of Alabama peanut fields (Ingram & Rodriguez-Kabana 1980) and up to 26% of Texas peanut fields (Wheeler & Starr 1987).
The purpose of the present investigation was to describe and isolate fungi from eggs of Meloidogyne spp.
Dr Daniel Thorogood, a plant breeder at the Aberystwyth-based Institute of Grassland and Environmental Research (IGER), explained that this particular breed of nematode, from the genus Meloidogyne naasi, is present in all sports pitches and grassland.