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Tylenchorhynchus cylindricus Cobb, 1913
Tylenchorhynchus dubius (Reynolds and Evans, 1935
Female: Body straight to slightly arcuate in fixed specimens, tapering at both ends, 0.65-0.99 mm long..
Annules distinct, coarse, 2 µm wide near midbody.
Lip region hemispherical, offset, exhibiting 5 (rarely 4 or 6) annules; labial sclerotization prominent towards basal plate and cheilostom.
Stylet well developed, with large anteriorly-cupped basal knobs; tapering portion being non-tubular and needle-like in its anterior two-fifths.
Orifice of dorsal esophageal gland about 2 µm from spear base.
Median esophageal bulb large, oval; basal bulb elongate-pyriform, with intestine joining its base slightly ventrally; esophago-intestinal valve (cardiac valve) prominent.
Sinuous, convoluted canals present in the intestinal region.
Ovaries outstretched with oocytes usually in single row.
Spermathecae rounded, usually with sperm.
Tail elongate-conoid, with unstriated, smoothly rounded distal end; intestine not extending into tail cavity.
Male: Body length 0.67-1.0 mm.
Spicules about 22 µm long, slightly arcuate, with large ventral flanges distally.
Gubernaculum 12 µm long, protrusible, its distal half enlarged with raised sides, proximal end anteriorly curved or crescent-shaped.
[Ref: CIH Descriptions of Plant-parasitic Nematodes,
Set 1, No. 7 (1972)]
Arid soils of Western U.S. on desert plants; Cathedral City, California.
D-rated pests in California.
In cotton, nematodes feed on root tips and possibly along the side on young roots.
Prunus in California; cotton in Arizona; citrus in Florida; pine in New Mexico; crested wheat grass (Agropyron cristatum) and juniper in Utah.
For an extensive list of host plant species and their susceptibility, copy the name
select Nemabase and paste the name in the Genus and species box
In cotton, feeding causes stunting of top growth and reduction in root system in both greenhouse and field trials in Arizona.
Also reported to cause severe damage to crested wheat grass in areas of Utah.
However, Riffle (1970) demonstrated that growth of seedling Pinus
ponderosa parasitized by T. cylindricus under greenhouse conditions
for 13 months was not significantly reduced.
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
select Nemabase Resistance Search and paste the name in the Genus and species box
CIH Descriptions of Plant-parasitic Nematodes, Set 1, No. 7 (1972).