Paratylenchus projectus		Contents		Rev 12/16/2024
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:

Chromadorea
       Rhabditida

        Tylenchina
        Tyl;enchuloidea

     Tylenchulidae
          Paratylenchinae

           Paratylenchus projectus

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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:

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Distribution:

East coast and midwestern U.S., Canada, Europe, New Zealand, and the Soviet Union. 

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Economic Importance:

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Feeding:

J2 and J3 feed; J4 has an incomplete stylet and molts to adult form after host stimulation. Nematodes insert stylet at or near base of root hairs and feed at one site for up to 6 days. 

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Hosts:

Cereals, grasses, ornamentals, celery, red clover, and cabbage.

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Life Cycle:

Ecophysiological Parameters:

Males and fourth-stage juveniles have no stylet and do not feed. 

J4 is the persistent stage - molt of the J4 is stimulated by host root diffusate, for example, carnation root diffusate.  The J4 do not molt to adults in water, but molt progressively over a 2 week period in carnation root diffusates (Rhoades and Linford, 1959).

In older pot cultures or field soils, the resistant J4 may be 80% of the population.

J4 distinguished from other stages by reduced or absent stylet and esophagus and accumulation of opaque granules in esophagus region (Rhoades and Linford, 1959).

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Damage:

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Management:

Control is difficult by crop rotation due to wide host range, or by fallow soil (J4 survives several years). 

Nematicides are not economical.

Resistance

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

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References:

Rhoades, H.L. and M.B. Linford. 1959. Molting of preadult nematodes of the genus Paratylenchus stimulated by root diffusates.  Science 130: 1476-1477.

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Copyright © 1999 by Howard Ferris.
Revised: December 16, 2024.