Gracilacus straeleni




Rev 02/13/2023

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           Gracilacus straeleni (De Cononck, 1931) Raski, 1976


      Paratylenchus straeleni

 Note: Many authors gave not accepted Raski's creation of the genus Gracilacus based largely on stylet length and swelling of body.  In those cases, this species is described as Paratylenchus straeleni.

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Morphology and Anatomy:


<0.45 mm long.

Male: Less ferquent than females.

[Ref: Raski, 1976)



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

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Several reports from throughout USA and worldwide.

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Economic Importance:

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Young, vermiform, female inserts its long stylet into root tissues and remains attached to the root surface by the stylet. Nematode feeds in epidermal, cortical parenchyma and sclerenchyma cells. Feeding induces cell wall thickening.

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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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Ghaderi, R., Kashi, L., Karegar, A. 2014. Contribution to the study of the genus Paratylenchus Micoletzky, 1922 sensu lato (Nematoda: Tylenchulidae). Zootaxa 3841:151-187.

Raski, D.J. 1962.  Paratylenchidae n.fam. with description of five new species of Gracilacus n.g. and an emendation of Cacopaurus Thorne, 1943, Paratylenchus Micoletzky, 1922 and Criconematidae Thorne, 1943.  Proc. Helminthol. Soc. Washington 29:189-207.

Raski, D.J. 1976. Revision of the Genus Paratylenchus Micoletzky, 1922 and Descriptions of New Species. Part III of Three parts--Gracilacus. J. Nematology 8:97-115.

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Copyright © 1999 by Howard Ferris.
Revised: February 13, 2023.