Paralongidorus australis

Paralongidorus australis	Contents	Rev 04/03/2023
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Paralongidorus Menu	Economic Importance	Damage
	Distribution	Management
Return to Longidoridae Menu	Feeding	References
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Classification:

     Enoplea
       Dorylaimida
        Dorylaimina
         Dorylaimoidea
          Longidoridae
           Longidorinae

Paralongidorus australis Stirling & McCulloch, 1984

Needle Nematode

Morphology and Anatomy:

Nematode is 7.6-10.6 mm long.

Both males and females occur.

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

Distribution:

First reported from poorly-growing rice in Queensland, Australia (Stirling and McCulloch, 1984).

Economic Importance:

Causes damage to rice, especially on impermable clay soils. Noticeable especially after flooding of the rice fields.

Hosts:

For an extensive host range list for this species, click

Life Cycle:

Ecophysiological Parameters:

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

Interestingly, this nematode causes damage to rice in clay soils that are relatively impenetrable. Are pore spaces sufficiently large for it to move through soil or is it moving on the soil surface when fields are flooded?

About a week after rice paddfies are flooded, patches of stunted yellow plants appear; the plants in the patches produced very low yields. Pathogenicity tests indicated the causal agent to be Paralongidorus australis. The nematode is a native Australian species living in flood-prone areas Queensland. In clay soils, the nematode can only move readily in water above the soil. Flooded paddy rice provides ideal conditions for the nematode to feed and multiply (Stirling, 2023)..

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Damage:

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Management:

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

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

Cultural Practices:

Since the nematode can only move in clay soils when they are flodded, production of rainfed upland rice is recommeneded to avoid the problem (Stirling, 2023).

Additional Information and Resources

Australasian Plant Pathology Society Factsheets on Plant-parasitic Nematodes (Prepared by Dr. Graham R. Stirling)

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PSN 034. Ectoparasitic plant-parasitic nematodes known to cause crop damage in Australia