Pratylenchus pratensisobrinus




Rev 06/01/2021

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           Pratylenchus pratensisobrinus Bernard, 1984.


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Morphology and Anatomy:

An amphimictic species of Pratylenchus.



  • Lip region  rounded, with three annules.
  •  Stylet stout, knobs large, cupped anteriorly.
  • Median bulb oval, valve conspicuous.
  • Esophageal glands elongated, overlapping intestine; dorsal gland nucleus near middle of lobe, subventral nuclei in the posterior portion.
  • Hemizonid near esophago-intestinal junction, the excretory pore immediately behind the hemizonid; hemizonion distinct, at about 60% of the gland lobe.
  • Gonad out-stretched; spermatheca square or oval to elongated usually filled with sperm.
  • Postuterine sac elongated, about 2 times the body width at the vulva.
  •  Tail conoid with terminus coarsely annulated or consisting of a large terminal annule.
  • Pphasmid centered in lateral field about midway on the tail.
  • Lateral field of four incisures, usually becoming three on the tail. 

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:


  •  Similar to female, but shorter, more slender, and with a slightly more delicate stylet.
  • Gonad outstretched.
  • Spicules relatively robust, evenly curved, partially cephalated; velum prominent, well developed.
  • Ggubernaculum curved, linear.
  • Caudal alae crenate, enveloping tail.
  • Phasmids near the middle of the tail.
  • Lateral field hardly extending past the spicules.

Ref: Bernard, 1984.

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Pratylenchus pratensisobrinus is reported from Adak Iskland in the Aleutian chain of islands, Alaska.

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Economic Importance:

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    Migratory endoparasite.    

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For an extensive host range list for this species, click

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Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click If species level data are not available, click for genus level parameters


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Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

For plants reported to have some level of resistance to this species, click


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Bernard, E.C. 1984. Hoplolaimoidea (Nematoda: Tylenchida) from the Aleutian Islands with Descriptions of Four New Species. J. Nematology 16:194-203.


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Copyright 1999 by Howard Ferris.
Revised: June 01, 2021.