Rootlesion nematode (English name)

A general term for a genus in the class Nematoda of the phylum Pectinifera. A group of important plant parasitic nematodes distributed widely around the world, both males and females are slender with body lengths of 0.5-0.8 mm. They have long been known as meadow nematodes that cause damage to pasture grasses. The nematodes move within the root tissue, laying eggs and multiplying, causing root necrosis and collapse, and causing the plant to wither and die. The plants that the nematodes damage (host range) are wide, with noticeable damage being caused to potato tubers, sweet potatoes, taro, chrysanthemums, strawberries, peaches, tea, and cedar seedlings. Of the nearly 50 species, about 10 other species are known in Japan, including P. penetrans , which is widely distributed north of the Kanto region, P. coffeae , which is distributed south of the Kanto region, and P. loosi , which is distributed in tea-growing areas.

[Minoru Ichinohe]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

袋形(たいけい)動物門線虫綱の1属の総称。世界的に広く分布する重要な植物寄生線虫の一群で、雌雄ともに体長0.5～0.8ミリメートルで細長い。イネ科牧草に被害を及ぼす草地線虫meadow nematodeとして古くから知られていた。線虫は根の組織内を移動しながら産卵増殖し、根を壊死(えし)崩壊させ、植物を枯死させる。線虫が被害を及ぼす植物（寄主範囲）は広く、ジャガイモ塊茎、サツマイモ、サトイモ、キク、イチゴ、モモ、チャ、スギ苗などで被害が目だつ。50種近くのうち、日本では、キタネグサレセンチュウP. penetransが関東地方以北に、ミナミネグサレセンチュウP. coffeaeが関東地方以南に、チャネグサレセンチュウP. loosiがチャ栽培地帯にそれぞれ広く分布するほか、約10種が知られている。

［一戸　稔］

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