Meloidogyne naasi

Meloidogyne naasi	Contents	Rev 01/06/2023
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
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

      Tylenchida
       Tylenchina
        Tylenchoidea
         Heteroderidae
          Meloidogyninae

Meloidogyne naasi Franklin, 1965

Barley root-knot nematode.

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

Morphology and Anatomy:

A,B,C=male; D,E,F=female; G,H,I,J,K=second-stage juvenile

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

Distribution:

Temperate areas of the United States and Europe. Originally described from field crops (cereals, grasses, sugarbeet) in England and Wales.

Economic Importance:

B-rated pest in California Nematode Pest Rating System.

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

Feeding:

Feeding site establishment and development typical of genus.

Hosts:

Type Host: Spring barley (Hordeum vulgare).

Grasses, cereals, and weeds.

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

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).

Galls are generally cylindrical, spindle-shaped, or hooked. Heavily infected plants are stunted, have a yellowish appearance and may die. Surviving plants tend to remain stunted and do not produce normal seed heads (Allen et al., 1970; Scaheck, 2023).

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

Severely affected plants wilt readily, even when soil moisture is sufficient, because galled roots have less ability to absorb and transport water. Nutrient deficiency symptoms including chlorosis may result from the reduced ability of galled roots to absorb and transport nutrients, even when levels are adequate in the soil. Stunting is a frequent result (Scheck, 2023).