Mesocriconema curvatum (Raski, 1952) de Grisse & Loof, 1965
Criconemoides curvatum Raski, 1952
Female: Body stout, slightly curved
ventrally; tapering slightly toward both extremities.
Annules with smooth posterior margins and generally without
Head not offset. Labial disc distinctly lower than in
Mesocriconema xenoplax; more or less
rectangular with slit-like amphid
apertures along its lateral
margins. Four well-developed, separate submedian lobes with
rounded anterior margins. First annule broken up into labial
plates, often irregularly; second annule transverse; third and
following annules retrorse.
Spear typical for genus, its length (56-70 Ãƒâ€šÂµm), about 25
times the width of shaft.
Excretory pore near base of
one annule long, often indistinct, located one to two
annules anterior to excretory
Intestine vacuolated, with indistinct outline.
Vulva open; in some specimens, anterior lip has two rounded
projections. Vagina not sigmoid, running in an oblique to almost
transverse direction. Uterus with round spermatheca
sperm near its anterior end (several European populations have
Tail conoid-rounded, terminal annule often
Male: Body annulation much finer and less
prominent than in female; annule
width 2.5-3.0 Ãƒâ€šÂµm at mid-body.
field marked by four longitudinal incisures.
Head end rounded.
Spear absent, mouth cavity and esophagus poorly developed and
Spicules slightly curved.
Tail tapering to acute terminus, with well-developed bursa.
Female juvenile: General morphology similar
to that of female.
Annules with smooth or slightly irregular posterior margins.
Male juvenile: More slender and with more
angular annulation than female juvenile. Spear absent.
[Ref: CIH Descriptions of Plant-parasitic Nematodes, Set 4,
No. 58 (1974)
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:
Western U.S.; also the east coast. M. curvata is
important in tree and ornamental nurseries in New Jersey.
in California Nematode Pest Rating System.
In carnation, it feeds ectoparasitically at root tips and in
root hair zone.
Penetrates cell wall by short thrusts of spear; median
esophageal bulb then pulsates. The rest of the body remains
immobile during feeding.
Anterior end of nematode (and occasionally, the entire body)
may become embedded into the root, especially when the population
density is high.
Locomotion of the nematode occurs through wave-like
contractions of the body, beginning in the tail region and moving
anteriorly. Movement is not undulatory, but rectilinear.
In pots, many nematodes remain near the surface; horizontal
spreading may be aided by water flow and splashing. Downward
movement is probably due chiefly to downward water current.
Cranberry, peach, clover, strawberry, and carnation.
Optimum temperature is probably near 24 C. At 30 C, reproduction was much lower and the size of the nematodes was slightly smaller than at 15-25 C.
Feeding can reduce root weight of carnations by 33% in 6
destruction of epidermis and necrosis of cortex. In peach,
cause extensive lesions and pits in roots. Criconemoides curvata is considered to
be one of the factors involved in peach decline. In cranberry,
causes retarded plant growth and inhibits formation of new
Steam soil used in greenhouse culture; clean root cuttings.
Applications of nematicides
in infected peach orchards
results in improved grwoth.
Host Plant Resistance, Non-hosts
Pinkerton, J. N.; Forge, T. A.; Ivors, K. L.; Ingham, R. E.. 1999.
Plant-parasitic nematodes associated with grapevines, Vitis vinifera, in
Oregon vineyards. Journal of Nematology, 31:624-634.
Brzeski, M., Y.E. Choi and P.A.A. Loof. 2002a. Compendium of the genus
Criconemoides Taylor, 1936 (Nematoda: Criconematidae). Nematology
Brzeski, M., P.A.A. Loof and Y.E. Choi . 2002b. Compendium of the genus
Mesocriconema AndrÃƒÆ’Ã‚Â¡ssy, 1965 (Nematoda: Criconematidae). Nematology
Cordero, M. A. Robert T. Robbins, Allen L. Szalanski.
2012. Taxonomic and Molecular Identification of Mesocriconema and
Criconemoides Species (Nematoda: Criconematidae). J. Nematology 44:
Geraert, E. 2010. The Criconematidae of the World: Identification of the
Family Criconematidae. Academia Press, Gent. 615p.
Loof, P.A.A and A. De Grisse. 1989. Taxonomic and nomenclatorial observations
on the genus Criconemella De Grisse and Loof, 1965 sensu Luc and
Raski, 1981. Med. Fac. Landn. Rijksuniv. Gent. 54:53-74.
Raski & Luc, Rev. Nematol. 10:409-444 (1987)