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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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