Tylenchorhynchus nudus

  

Contents

  

Rev 04/03/2021

Stunt Nematode Classification Hosts
Morphology and Anatomy Life Cycle
Return to Tylenchorhynchus Menu Economic Importance Damage
Distribution Management
Return to Telotylenchidae Menu Feeding  References
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Classification:

Rhabditida
       Tylenchina
        Tylenchoidea
           Telotylenchidae
             Telotylenchinae

Tylenchorhynchus nudus Allen, 1955

   

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Morphology and Anatomy:

Head Region

 

Drawings by Thorne and Malek, 1968; photographs by Peter Mullin (UNL), 2000.

 

Female tail

Male tail

  • L = 0.8 mm; a = 36; b = 5; c = 17;  V = 52 

  • Body cylindroid, tapering to rounded lip region bearing 2 annules. Lip annules often less prominent than illustrated with occasionally 3 instead of 2.

  • Lateral fields with 4 incisures.

  • Stylet 21µm with large, cupped knobs; protractor muscles attached to a sclerotized band at the base of lip region.

  • Excretory pore midway between median bulb and esophagus base. Basal bulb slightly longer than body diameter.

  • Spermatheca about half as long as body width, packed with sperm.

  • Male tail tapering, arcuate with minutely striated, broad caudal alae.  Spicules about 24 µm, guided by thin, trough-like gubernaculum.

  • (Data from Tom Powers, UNL)

 

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

 

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Distribution:

Generally distributed in cultivated and virgin soil throughout South Dakota.  One collection from cultivated field near Minden, Nebraska.

 
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Economic Importance:

 

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Feeding:

Migratory ectoparasite - browses on epidermal cells and root hairs.

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Hosts:

Grasses

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 are required for reproduction.  

 
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Damage:

Root growth of bentgrass (Agrostis palustris) and annual bluegrass (Poa annua), was suppressed by T.  nudus, with most suppression on bluegrass. 

Annual bluegrass produced longer roots than bentgrass both in the presence and in the absence of the nematode. 

Maximum root length was related to T. nudus population levels on both grasses.

(From a study by Davis, et al.1994)


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Management:

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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References:

Davis, R. F.;  Noel, G. R.;  Wilkinson, H. T.  1994.  Pathogenicity of Tylenchorhynchus nudus to creeping bentgrass and annual bluegrass.  Plant Disease, 78:169-173.

Tom Powers and Peter Mullin, University of Nebraska

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