Nacobbus bolivianus




Rev 11/19/2019

False Root-knot Nematode Classification Hosts
Morphology and Anatomy Life Cycle
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    Nacobbus bolivianus Lordello, Zamith and Boock, 1961

    False Root-knot Nematode

Originally described as N. serendipiticus bolivianus by Lordello, Zamith and Boock, 1961, the nematode was synonymized with N. aberrans by Sher, 1970.  Recent molecular and host-range studies show differences among Central and South American populations of Nacobbus, with populations from Bolivia and Peru disticnt from others.  Consequently, Reid et al. (2003). resurrected N. serendipiticus bolivianus and elevated it to species status: N. bolivianus.

DNA sequences suggest three groupings of the Nacobbus aberrans species complex: i) North/South American group of populations from Mexico, Argentina and Ecuador; South American group of by populations from Argentina; and Nacobbus bolivianus represented by populations from Peru and Bolivia.  Overlap of circles represents shared DNA sequences.
Diagram from Manzanilla-López et al. (2010).
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Morphology and Anatomy:

  Immature Females:
  • vermiform.
  • tylenchid stylet with well developed basal knobs;
  • head not off-set;
  • esophageal gland overlapping the intestine dorsally;
  • lateral field with four incisures;
  • monovarial
  • vulva close to the anus, sub-terminal
  Mature Females:

Saccate (0.8 to 1.4 mm long and 0.2 to 0.45 mm wide).





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



Vermiform and of the same body length as females.

Caudal alae peloderan.

Spicules and gubernaculum.

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Bolivia and Peru.

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Economic Importance:


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All juveniles are migratory endoparasites and penetrate plant root tips and/or axial roots.  

Mature females penetrate roots, become swollen and sedentary, cause formation of root galls and enlarged cells.




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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

The nematode migrates through plant tissues as a juvenile; it initiates a gall and becomes sedentary as a young female.

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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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Manzanilla-López R.H. 2010.  Speciation within Nacobbus: consilience or controversy? Nematology 12:321-334.

Manzanilla-Lo pez, R. H., M. A. Costilla, M. Doucet, J. Franco, R. N. Inserra, P. S. Lehman, I. Cid del Prado-Vera, R. M. Souza, and K. Evans. 2002. The genus Nacobbus
Thorne & Allen, 1944 (Nematoda:Pratylenchidae):Systematics, distribution, biology and management. Nematropica 32:149-227.

Reid, A., Manzanilla-Lo pez, R. H., Hunt, D.J. 2003. Nacobbus aberrans (Thorne, 1935) Thorne & Allen, 1944 (Nematoda: Pratylenchidae); a nascent species complex revealed by RFLP analysis and sequencing of the ITS-rDNA region. Nematology 5:441-451.

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Copyright © 1999 by Howard Ferris.
Revised: November 19, 2019 .