Tylenchorhynchus acutus

Tylenchorhynchus acutus	Contents	Rev 10/15/2012
Stunt Nematode	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Tylenchorhynchus Menu	Economic Importance	Damage
	Distribution	Management
Return to Dolichodoridae Menu	Feeding	References

Classification:

Rhabditida Tylenchina Tylenchoidea
Dolichodoridae
Telotylenchinae

Tylenchorhynchus acutus

Morphology and Anatomy:

See genus description for general configuration.

Female: L = 0.75 mm; V = 58; c=23. Males apparently absent.
Five lines in lateral field.
Lip region with 5 or 6 annules, set off by deep constriction.
Spear 15µm long with massive cupped knobs.
Esophagus narrows to a narrow tube where it attaches to the median bulb. Usually one large gland nucleus visible in the basal bulb.
Eggs about three times body width.

The only way to differentiate it from T. acutoides is by the absence of males (Tom Powers, UNL).

Distribution:

Common on rangeland grasses in midwest and Rocky mountain areas.

Widely distributed throughout the Great Plains where it is the most common species of the genus.

This species is common in western Nebraska. Its found in cultivated fields and in rangeland. (Tom Powers, UNL)

Economic Importance:

Tylenchorhynchus acutus reduced growth of crested wheat grasses, Russian wild rye, intermediate wheat grass, and Snake River wheat grass in clay-sand and sandy loam soils.

Feeding:

Ectoparasite - browses on epidermal cells and root hairs.

Hosts:

Grasses, including crested wheat grasses, Russian wild rye, intermediate wheat grass, and Snake River wheat grass.

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

Tylenchorhynchus acutus

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

Life Cycle:

Males not required for reproduction.

Reproduction greatest in sandy loam soil.

Damage:

Pathogenicity was greatest in sandy loam soil.
Some cultivars of the grasses were more tolerant of the nematode damage than others.

Management:

Resistance

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

Tylenchorhynchus acutus

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

Griffin, G. D. 1996. Importance of soil texture to the pathogenicity of plant-parasitic nematodes on rangeland grasses. Nematropica 26:27-37
Griffin, G.D. 1996. Biology and pathogenicity of three ectoparasitic nematode species on crested wheatgrasses. Nematropica 26:15-25.