Tylenchorhynchus acutus




Rev 04/03/2021

Stunt Nematode Classification Hosts
Morphology and Anatomy Life Cycle
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Tylenchorhynchus acutus Allen, 1955


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Morphology and Anatomy:

See genus description for general configuration.

  • Female:  L = 0.75 mm; V = 58; c=23. Males apparently absent.

  • Five lines in lateral field.

  • Lip region with 5 or 6 annules, set off by deep constriction.

  • Spear 15µm long with massive cupped knobs.

  • Esophagus narrows to a narrow tube where it attaches to the median bulb. Usually one large gland nucleus visible in the basal bulb.

  • Eggs about three times body width.

The only way to differentiate it from T. acutoides is by the absence of males (Tom Powers, UNL).


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


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Common on rangeland grasses in midwest and Rocky mountain areas.

Widely distributed throughout the Great Plains where it is the most common species of the genus.

This species is common in western Nebraska. Its found in cultivated fields and in rangeland. (Tom Powers, UNL)

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Economic Importance:

Tylenchorhynchus acutus reduced growth of crested wheat grasses, Russian wild rye, intermediate wheat grass, and Snake River wheat grass  in clay-sand and sandy loam soils.

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Ectoparasite - browses on epidermal cells and root hairs.

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Grasses, including crested wheat grasses, Russian wild rye, intermediate wheat grass, and Snake River wheat grass.

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

Males not required for reproduction.

Reproduction greatest in sandy loam soil.

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Pathogenicity was greatest in sandy loam soil.
Some cultivars of the grasses were more tolerant of the nematode damage than others.   

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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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   Griffin, G.  D. 1996. Importance of soil texture to the pathogenicity of plant-parasitic nematodes on rangeland grasses.  Nematropica 26:27-37
   Griffin, G.D. 1996. Biology and pathogenicity of three ectoparasitic nematode species on crested wheatgrasses.  Nematropica 26:15-25.


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Copyright © 1999 by Howard Ferris.
Revised: April 03, 2021.