Heterodera raskii

  

Contents

  

Rev 10/18/2023

Raski's Cyst Nematode Classification Hosts
Morphology and Anatomy Life Cycle
Return to Heterodera Menu Economic Importance Damage
Distribution Management
Return to Heteroderidae Menu Feeding  References
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Classification:

      Tylenchida
       Tylenchina
        Tylenchoidea
         Heteroderidae
          Heteroderinae

Heterodera raskii Basnet and Jayaprakash, 1984

 A member of the Cyperi group of Heterodera.spp.
Synonyms:
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Morphology and Anatomy:

General Characteristics of the Cyperi Group of Heterodera

Cysts lemon-shaped or rounded
Ambifenestrate
Bullae absent or present
Underbridge bifurcate or absent
Vulval slit long
J2 incisures 3 or 4
Monocotyledonous hosts

(Handoo and Subbotin, 2018; Subbotin et al., 2010, Subbotin et al. 2023)

 

  Female:  575-700m long, 210-290m wide. Pearly white color, protruding neck and prominent vulval cone.

 

Considered a member of the "goettingiana" group.

Cyst:  Light to dark brown, elongate, ovoid, ambifenestrate with weak underbridge.  No egg sac, eggs retained in cyst.

 
Male:  Typical of genus.

J2:  500m long, rounded stylet knobs.

Illustrations adapted from Basnet and Jayaprakash (1984).

 

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

 

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Distribution:

Reported from roots of Cyperus in Hyderabad, India.

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Economic Importance:

 

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Feeding:

Sedentary semi-endoparasite of roots, feeding patterns typical of genus Heterodera.

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Hosts:

Hosts of the Cyperi group of Heterodera spp. are usually monocotyledonous plants, Described from roots of bulb grass, Cyperus bulbosus Vab. Establishes feeding sites on both roots and tubers.

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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Damage:

Slow decline and loss of vigor of host grass.

Management:

For plants reported to have some level of resistance to this species, click

 

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References

Basnet, C. P. and A. Jayaprakash (1984). Heterodera raskii, new species (Heteroderidae: Tylenchina) a cyst nematode on grass from Hyderabad, India. Journal of Nematology 16: 213-216.

Handoo, Z.A., Subbotin, S.A. 2018. Taxonomy, identification and principal species. Chapter 15 in Perry, R.N. Moens, M., and Jones, J.T.(eds)  Cyst Nematodes. CAB International.

Subbotin, S,A., Mundo-Ocampo, M., Baldwin, J.G. 2010. Systematics of Cyst Nematodes (Nematode: Heteroderinae). Nematology Monographs and Perspectives Volume 8B, D.J. Hunt and R.N. Perry (eds) Brill, Leiden, The Netherlands 512p

Subbotin, S.A., Roubtsova, T.V., Bostock, R.M., Maafi, Z.T., Chizhov, V.N., Palomares-Rius, J.E., Pablo Castillo, P. 2023. DNA barcoding, phylogeny and phylogeography of the cyst nematode species of the Schachtii group from the genus Heterodera (Tylenchida: Heteroderidae). Nematology (in press).

 

 

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