Meloidogyne naasi




Rev 12/27/2013

Barley root-knot nematode Classification Hosts
Morphology and Anatomy Life Cycle
Return to Meloidogyne Menu Economic Importance Damage
Distribution Management
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        Meloidogyne naasi 

Barley root-knot nematode.

The specific name is derived from the initials of the UK National Agricultural Advisory Service.

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Morphology and Anatomy:


A,B,C=male; D,E,F=female; G,H,I,J,K=second-stage juvenile
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Temperate areas of the United States and Europe. 

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Economic Importance:

B-rated pests in California. 

In California, this species can cause yield losses of 50-75% in barley grown under continuous cropping in the Tulelake innermountain region. 


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 Feeding site establishment and development typical of genus.

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Grasses, cereals, and weeds. 

For an extensive list of host plant species and their susceptibility, copy the name

Meloidogyne naasi

select Nemabase and paste the name in the Genus and species box


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Life Cycle:

Egg hatch in water is very limited unless eggs have been chilled by storage below 5C for 1 to 7 weeks  (Franklin et al, 1971). 

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Galls are generally cylindrical, spindle-shaped, or hooked. 

Feeding causes necrosis, hyperplasia, and hypertrophy of cortex; also causes disorganization of xylem elements. 


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Crop rotation can be effective in California (1 year fallow or 2 seasons of potatoes increased barley yield - Allen, 1970).

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

For a list of plant species or cultivars (if any) reported to be immune or to have some level of resistance to this nematode species, copy the name

Meloidogyne naasi

select Nemabase Resistance Search and paste the name in the Genus and species box


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CIH Descriptions of Plant-parasitic Nematodes, Set 2, No. 19 (1973)

Franklin, M.T., S.A. Clarke and J.A. Course. 1971. Nematologica 17:575-590.

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Copyright 1999 by Howard Ferris.
Revised: December 27, 2013.