Meloidogyne naasi		Contents		Rev 10/20/2008
Barley 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
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Classification:

      Tylenchida
       Tylenchina
        Tylenchoidea
         Heteroderidae
          Meloidogyninae
        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:

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Distribution:

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:

 Feeding site establishment and development typical of genus.

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Hosts:

Grasses, cereals, and weeds. 

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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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Damage:

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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Management:

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

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References:

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: October 20, 2008.