Root-Knot Nematode

(redirected from Meloidogyne)

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 ?
chlamydosporia y Carbofuran son compatibles, y que su aplicacion integrada en las raices de plantulas de guayabo, variedad Palmira ICA-1, antes o despues de la presencia de Meloidogyne spp.
In the state of Pernambuco, the problems caused by water deficit become worse with the expansion of sugarcane cultivation to the coastal plains, areas with predominance of the nematode species from the genus Meloidogyne, in which the presence of sandy soils and the occurrence of long dry seasons are common (Barbosa et al.
Juvenile hatching of Meloidogyne incognita was also greatly inhibited by the extracts.
Specific topics include a tool for detecting crop water status using airborne high-resolution thermal imagery, the physiological response of mungbean (Vigna radiata) to water deficit stress and Meloidogyne javanica infection, the effects of climate change on flood frequency in the Luvuvhu River Catchment in South Africa's Limpopo Province, the role of soil database classification in unsaturated zone modeling, and Nigeria as a case study of media advocacy for sustainable water management in Africa.
El complejo de nematodos del platano en la zona cafetera incluye a los generos Helicotylenchus, Meloidogyne, Pratylenchus y Radopholus (Guzman-Piedrahita & Castano-Zapata, 2005); ademas de la clasificacion taxonomica que se les ha dado, sus habitos de ectoparasitos y endoparasitos sirven como punto de referencia para su identificacion y determinan en gran medida el dano que causan.
In vitro evaluation of nematophagous fungi of Costa Rica rice-growing regions against the root-knot Meloidogyne javanica
No ano de 2003, foi observada a ocorrencia de Meloidogyne javanica parasitando plantas de teca com dois anos de idade, em duas areas no municipio de Nova Maringa, regiao norte do estado de Mato Grosso.
Effect of the foliage of Tagetes minuta on Meloidogyne incognita root-galling on Capsicum annuum in a greenhouse
Experiments were carried out to screen resistance of chili cultivars against Meloidogyne incognita and Sclerotium rolfsii and their integrated management by using derosol, cadusafos and Trichoderma harzianum in the green house at 25 +- 4AdegC.
The genus Meloidogyne (GOELDI, 1987) includes the plant nematodes most injurious to vegetables, particularly to tomato crops, causing high harvest losses, mostly in tropical and subtropical agriculture (KIEWNICK & SIKORA, 2006).
Main are of cotton plant-parasitic nematode species Meloidogyne incognita (Kofoid & White, 1919, Chitwood, 1949), Rotylenchulus reniformis (Linford & Oliveira, 1940) Pratylenchus brachyurus (Godfrey, 1929) Filipjev & Sch.
However, despite crop's rusticity, the nematode Meloidogyne enterolobii presence in the main producing regions has compromised agricultural production, leading the plants to death in some cases (CARNEIRO et al.