Meloidogyne fallax

 

Contents

 

Rev 08/30/2022

False Columbia Root-knot Nematode Classification Hosts
Morphology and Anatomy Life Cycle
Return to Meloidogyne Menu Economic Importance Damage
Distribution Management
Return to Heteroderidae Menu Feeding  References
    Go to Nemaplex Main Menu   Go to Dictionary of Terminology

Classification:

      Tylenchida
       Tylenchina
        Tylenchoidea
         Heteroderidae
          Meloidogyninae

           Meloidogyne fallax Karssen, 1996
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Morphology and Anatomy:

 

Female:  Anterior;  note excretory pore on right and dorsal esophageal gland opening into esophagus lumen.
Mature Female:  Body morphology.
   
Male:  Anterior Male:  Posterior - spicules and gubernaculum, no caudal alae.

Second-stage juvenile

Meloidogyne fallax is morphologically similar to the Columbia root-knot nematode (M. chitwoodi). It differs from M. chitwoodi in that males and females have longer stylets and that the J2 has a longer tail and hyaline portion.

The species can be separated by biochemical and molecular techniques: isozyme patterns esterase and malate dehydrogenase, fatty acid binding protein, and species-specific primers   (Karssen, 1994; Peterson et al., 1997; Tastet et al., 2001).

 

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

 

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Distribution:

Belgium, France, Germany and the Netherlands,  Australia, New Zealnd, the United States and South Africa ( CAB International, 2001; Nobbs et al., 2001; Elling, 2013; Fourie et al., 2002).

 

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Economic Importance:

Occurs in the U.S., reproted from golf course greens  (Nischwitz et al., 2013).

Its most important agronomic host is potato, in which it can cause total yield losses due to quality defects and imposition of quarantines (Elling, 2013).

 

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Feeding:

Sedentary endoparasite.

Feeding site establishment and development typical of genus.

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Hosts:

Type host: tomato (Solanum lycopersicum)

Meloidogyne fallax has some hosts in common with M. chitwoodi: alfalfa (Medicago sativa), carrot (Daucus carota), potato (Solanum tuberosum), sugarbeet (Beta vulgaris), and tomato (Solanum lycopersicum). 

Hosts not shared with M. chitwoodi include: hemerocallis (Hemerocallis sp.), Dicentra spectabilis, Oenothera erythrosepala, and Phacelia tenacetifolia.

Other differential hosts which are infected by M. chitwoodi but not by M. fallax are bean (Phaseolus vulgaris) and corn (Zea mays).

 The following hosts of M. fallax but not reported for M. chitwoodi are artichoke (Cynara scolynus), lettuce (Lactuca sativa), and oyster plant (Scorzonera hispanica).

More information is needed on the host status of cereals to M. fallax.

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:

The nematodes cause small, round galls at root tips. Females produce egg masses protruding from the root surface (CAB International, 2001; EPPO, 2001).

Like M. chitwoodi, the major damage by M. fallax on potato tubers is a nematode-induced blemish which lowers or negates their marketability. Both species incite small galls, typically without secondary roots, and can lead to stunting and yellowing aboveground.
In potato tubers, they cause numerous small pimple-like swellings

     

M. fallax is considered as closely related to M. chitwoodi; the two species can hybridize and produce viable F1 progeny under greenhouse conditions (Elling, 2013)

 

 
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Management:

Dispersed through root material, soil debris and by poorly sanitized seed potatoes and bare root propagative material.

Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

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

Quantitative PCR methods indicate potential for predicting yield loss in potato from M. fallax DNA measured in soil at planting and harvest (Hay et al., 2016).

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References:

CAB International. 2001. Meloidogyne fallax in Crop protection compendium, global module, 3rd editon. Wallingford, UK: CAB International.

Elling, A.A. 2013. Major Emerging Problems with Minor Meloidogyne Species. Phytopathology 103:1092-1102.

Epppo. 2001. Epppo PQR Database. Paris France.

Fourie, H., C. Zijlstra, A.H. McDonald and G. A. Venter. 2002.  Advances in applied nematode research in South Africa after introduction of the SCAR-PCR technique for nematode identification. Nematology  4:160-161.

Hay, F.S., Kathy Ophel-Keller, Diana M. Hartley, and Sarah J. Pethybridge. 2016. Prediction of Potato Tuber Damage by Root-Knot Nematodes using Quantitative DNA Assay of Soil. Plant Disease 100:592-600.

Karssen, G. 1995. Morphological and biochemical differentiation in Meloidogyne chitwoodi populations in the Netherlands. Nematologica 41:314-315.

Nischwitz, N., A. Skantar, Z.A. Handoo, M.N. Hult, M.E. Schmitt, and M.A. McClure. 2013. Occurrence of Meloidogyne fallax in North America, and Molecular Characterization of M. fallax and M. minor from U.S. Golf Course Greens. Plant Disease 97:1424-1430.

Nobbs, J.M., Q. Liu, D. Hartley, Z. Handoo, V. M. Williamson, S. Taylor, G. Walker, and J. Curran. 2001. First record og Meloidogyne fallax in Australia. Australian Plant Pathology 30:373.

Paterson D. J., and T. C. Vrain. 1996. Rapid identification of Meloidogyne chitwoodi, M. hapla, and M. fallax using PCR primers to amplify their ribosomal intergenic spacer. Fundamental and Applied Nematology 19:601-605.

Society of Nematologists Regulatory Committee, 2002.

Subbotin, S.A., Palomares-Rius, J.E., Castillo, P. 2021. Systematics of Root-knot Nematodes (Nematoda: Meloidogynidae). Nemaology Monographs and Perspectives Vol 14. Brill, Leiden. 857p.

Tastet. C., F. Val, M. Lasage, L. Renault, L. Marche, M. Bpssis, and D. Mignieri. 2001. Application of a putative fatty acid binding protein to discriminate serologically the two European quarantine root-knot nematodes, Meloidogyne chitwoodi and M. fallax, from other Meloidogyne species. European Journal of Plant Pathology 107:821-832.
 

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Copyright © 1999 by Howard Ferris.
Revised: August 30, 2022.