Rev 07-09-2021

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              Trichodorus Cobb, 1913

(47 known species as of 1996)

Etymology - from the Greek trichos (a hair) and dory (a spear).

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Morphology and Anatomy:


Body configuration usually rounded at both ends.

Cuticle tends to swell in water and fixative when nematodes are killed.

Curved onchiostyle with dorsal groove.

Females: Diovarial.

Males: Caudal alae absent. Single testis.

Male of Trichodorus obtusus
Photograph by W.T. Crow, University of Florida

Ref. Decraemer, W. 1995


Body size range for the species of this genus in the database - Click:
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Economic Importance:

Feeding by species of these nematodes stunts roots, transmits Tobraviruses including Tobacco Rattle Virus, Pea early-browning Virus and Pepper Ringspot Virus.

Tobraviruses are straight tubular particles with two size ranges, 180-210 nm and 45-115 nm. Trichodorus and Paratrichodorus are vectors.

Trichodorus sp. damage to onions in The Netherlands.  Fourth plot from bottom of photograph treated with nematicide.
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At root tip, by repeated thrusting of the oonchiostyle within a polysaccharide feeding tube.  Cell contents move along the groove along the dorsal side of the onchioostyle.

Trichodorus sp. feeding with onchiostyle inserted in root hair cell
Photograph by Urs Wyss, University of Kiel, Germany
Polysaccharide "feeding tube" remaining in cell wall after onchiostyle withdrawal.
Photograph by Urs Wyss, University of Kiel, Germany
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Nematodes in the Trichodoridae have wide host ranges.  
For an extensive host range list for this genus, click
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Life Cycle:

For Ecophysiological Parameters for this genus, click 
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Root tip damage causes root elongation to cease. Hence "stubby root" symptoms.

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Decraemer W. 1995. The Family Trichodoridae: Stubby Root and Virus Vector Nematodes. Developments in Plant Pathology, 6. Dordrecht: Kluwer Academic Publishers

Decraemer, W. 2011. Virus vector families Part II. Trichdoridae.Academia Press, Gent.123p.



Copyright © 1999 by Howard Ferris.
Revised: September 07, 2021.