Paratylenchus neoamblycephalus  

 

Contents

 

Rev 09/13/2023

Pin Nematode  Classification Hosts
Morphology and Anatomy Life Cycle
Return to Paratylenchus Menu Economic Importance Damage
Distribution Management
Return to Tylenchulidae Menu Feeding  References
    Go to Nemaplex Main Menu   Go to Dictionary of Terminology

Classification:

      Tylenchida
       Tylenchina
        Tyl;enchuloidea
          Tylenchulidae
          Paratylenchinae


           Paratylenchus neoamblycephalus Geraert, 1965

Nomenclature: Reuver, 1959 described a Paratylenchus species as P. amblycephalus. However, subsequent sampling at the type l;ocality revealed a micture of two species, the species described by Reuver as P. amblycephalus (mainly) and P. projectus.  The specimen that Reuver designated as holotype for P. amblycephalus was actually P. projectus.  Geraert, 1965 selected a holotype from the main species present and designated it P. neoamblycephalus.  Consequently, the name P. amblycephalus is no longer valid (Raski, 1975)

Back to Top

Morphology and Anatomy:

  Small plant-parasitic nematodes, 0.3mm long. 

Females:  Gravid female may swell anterior to vulva.

Strong stylet, usually about 36 µm.

Ovary single, outstretched.   

Males:  Reduced, with stylet reduced or absent, and probably do not feed. 

Often their starved bodies are marked by characteristic banding patterns as food reserves are depleted.



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

Back to Top

Distribution:

California, Europe, Africa, North and South America, and Australia. 

Back to Top

Economic Importance:

 
Back to Top

Feeding:

Paratylenchus neoamblycephalus feeds singly or in groups of up to 15, especially at ruptures or where lateral roots emerge; heads remain in cortex
Nematodes were observed feeding ectoparasitically, but with heads embedded in roots as deep as the cortex. The nematodes cause small lesions (possibly caused by oxidation of phenolic compounds in roots) and lateral root death (Braun and Lownsbery, 1975)..        

Back to Top

Hosts:

Rose, peach, apricot, apple, grape, Prunus (especially prunes), plum rootstocks - Myrobalan and Marianna, other herbaceous plants. 

Apple is a host in Europe and Australia, but not in California. 

This species is the most commonly occurring plant-parasitic nematode in California prune orchards. 

Non-hosts include fig and walnut.

For an extensive host range list for this species, click

 

Back to Top

Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click If species level data are not available, click for genus level parameters

 

Males and fourth-stage juveniles have no stylet and do not feed. Fourth stage juveniles of Paratylenchus are the survival stage (dauer) in some species.

Back to Top

Damage:

In greenhouse tests, top growth of plum reduced about 25% by high numbers of nematodes (Braun and Lownsbery), 1975.

Elimination of Paratylenchus neoamblvcephalus from soil by fumigation with 1,2-dibromoethane stimulated the growth of Myrobalan seedlings grown in it. Addition of a suspension of P. neoamblycephalus to Myrobalan seedlings inhibited their growth as compared to noninoculated controls.

 

Back to Top

Management:

Usually not managed, nematicides have been used. 

Resistance

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

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

 

Back to Top

References:

Braun A.L. and Lownsbery, B.F. 1975. The pin nematode, Paratylenchus neamblycephalus, on myrobalan plum and other hosts J. Nematology 7:336-347.

Geareart, E. 1965. The genus Paratylenchus. Nematologica 11:301-334.

Raski, D.J. 1975. Revision of the Genus Paratylenchus Micoletzky, 1922 and Descriptions of New Species. Part II of Three parts. J. Nematology 7 :274-295.

Reuver I. 1959. Untersuchungen Uber Paratylenchus amblycephalus n. sp. (Nematoda, Criconematidae). Nematologica 4:3-15. 25. 

 

 

Back to Top

For more information about nematodes, Go to Nemaplex Main Menu.
Copyright © 1999 by Howard Ferris.
Revised: September 13, 2023.