Aphelenchoides arachidis




Rev 06/01/2021

Groundnut Testa Nematode Classification Hosts
Morphology and Anatomy Life Cycle
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Aphelenchoides arachidis Bos, 1977

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Morphology and Anatomy:



  • Body slended
  • Lateral field with trwo incisures
  • Lip region flattened
  • Stylet with distinct basal knobs
  • Esophageal ovelapping intestine dorsally
  • Monodelphic, prodelphic, ovary usually outstretched., oocytes in a single file.
  • Vulva a transverse slit with slightly swollen lips
  • Post-vulval sac extending about half the distance between vulva and anus
  • Tail conoid with a bluntly-rounded terminus and a terminal mucron


  • Single testis, generally outstretched
  • Rose-thorn spicules
  • No bursa
  • Tail conoid to pointed terminua, sometimes with small mucron.

    Ref: Bridge and Hunt, 1985

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

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Described from groundnuts in northern Nigeria

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Economic Importance:

Marketable value of ground nuts is reduced and seed weights reduced by >30%.


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Endoparasite on tissues of the testa and internal tissues of pods.  Occursin extremely high numbers, as many as 35,000 nematodes per testa and whole pods > 113,000.

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The following are listed as hosts in various literature sources:

Arachis hypogaea L.    


Arachis hypogaea L. var   F. 439.4


Arachis hypogaea L. var   S. 38


Arachis hypogaea L. var   S. 61


Arachis hypogaea L. var   Spanish 205


Arachis hypogaea L. var   US. 608


Arachis hypogaea L. var   US. 617


Arachis hypogaea L. var   US. 628


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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Test of infested seeds is translucent when removed from pod and then becomes very dark and seeds are shrivelled.


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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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Bridge, J., W. S. Bos, L. J. Page, and C. McDonald. 1977. The biology and possible importance of Aphelenchoides arachidis, a seed-borne endoparasitic nematode of groundnuts of groundnuts from northern Nigeria. Nematologica 23:253-259.

Bridge, J. and Hunt, D.J. 1985. Aphelenchoides arachidis  CIH Descriptions of Plant-parasitic Nematodes No. 116.

Ibrahim, S. K., R. N. Perry and D. J. Hooper. 1994. Use of esterase and protein patterns to differentiate two new species of Aphelenchoides on rice from other species of Aphelenchoides and from Ditylenchus angustus. Nematologica 40:267-275


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Copyright © 1999 by Howard Ferris.
Revised: June 01, 2021.