Cactodera weissi   




Rev 10/07/2023

Knotweed Cyst Nematode Classification Hosts
Morphology and Anatomy Life Cycle

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           Cactodera weissi (Steiner, 1949) Krall & Krall, 1978


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Morphology and Anatomy:


Female: Cyst stage present.  

Cyst of Cactodera weissi

  • Body globose, with short neck and terminal cone.  
  • Cuticle thick, with superficial irregular transverse ridges interrupted by short markings, more or less longitudinal; D-layer present (absent in C. betulae).
  • Vulva terminal surrounded by a circumfenestration; vulval slit less than 20 µm long; no underbridge; no bullae; anus without fenestration.  
  • All eggs retained in body (no egg-mass).  
  • Eggs without punctations or tubercles.


  • Body twisted.  90 degrees
  • Stylet less than 30 µm long.
  • Lateral field with four lines.
  • Spicules greater than 30 µm long, slightly curved, pointed at distal extremity, obliquely directed.  
  • No cloacal tubus.  
  • Tail short, hemispherical. 

Second-stage juveniles:

  • Stylet less than 30 µm long. 
  • Lateral field with four lines. 
  • Esophageal glands filling body cavity.  
  • Tail conical, pointed with hyaline terminal half.  
  • Phasmids punctiform.  

    Luc, Maggenti & Fortuner (1988); Subbotin et al., 2020

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

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Reported fromk several areas in USA and Canada;  for example, on weed species in Michigan, USA.

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Economic Importance:


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Nurse cell system: A syncytium.

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Knotweed (Polygonum pennsylvanicum and P. persicaria)

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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Baldwin, J.G., Mundo-Ocampo, M., McClure, M. 1997. Cactodera salina n.sp. From the estuary plant, Salicornia bigelovii, in Sonora, Mexico. J. Nematology 29:465-473.

Evans, K., Rowe, J.A. 1998. Distribution and economic importance. In S.B. Sharma (ed). The Cyst Nematodes. Kluwer

Luc, Maggenti & Fortuner, Rev. Nematol. 11(2):159-176 (1988).

Subbotin, S.A., Mundo-Ocampo, M., Baldwin, J.G. 2010. Systematics of Cyst Nematodes (Nematode: Heteroderinae). Nematology Monographs and Perspectives Volume 8A , D.J. Hunt and R.N. Perry (eds) Brill, Leiden, The Netherlands 351p


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Copyright © 1999 by Howard Ferris.
Revised: October 07, 2023.