Tylenchocriconema alleni




Rev 02/13/2023

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Morphology and Anatomy Life Cycle
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          Tylenchocriconema alleni Raski & Siddiqui 1975

The type and only species of the genus.

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Morphology and Anatomy:


Tylenchocriconema alleni is the only known species of this genus.  It has characteristics of the subfamily Tylenchocriconematinae.

In summary: procarpus amalgamated with metacorpus; isthmus distinct and slender; long postcarpus with enclosed glands; cuticle finely annulated. 

Females: Long, slender, prominent stylet; single ovary. 


Males: Stylet absent; degenerate esophagus; do not feed; have no sheath; have long, curved spicules and long, slender caudal alae.


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

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Economic Importance:


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Migratory ectoparasites.      

Feeds on leaf surfaces and in the crowns of the bromeliad, Tillandsia flabellata. The nematodes do not penetrate the leaves.

Large numbers of nematodes may be found in crowns just below the water line. 

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The bromeliad, Tillandsia flabellata (Lehman, 1986).. 

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

Clusters of nematodes and eggs remain on dry , dead leaves, appearing as a woolly mass.

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Healthy bromeliad plants show light brown lesions on the upper surfaces of leaves about 6 weeks after inoculation with the nematode  In severe infections flowering is inhibited and leaves die (Lehman, 1986)..

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Inspection of plants imported from Central America.

Roguing of dead leaves to remove nematode incoculum.

Treatment with oxamyl has been effective (Lehman, 1986).

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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Lehman, P.S. 1986. Tylenchocriconema alleni, a pathogen of the bromeliad, Tillandsia flabellata. Florida Dept. of Agric. Nematology Circular 129.

Raski & Luc, 1987.  Rev. Nematol. 10(4):409-444.

H. Ferris 

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