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Immature Females:
- vermiform.
- tylenchid stylet with well developed basal knobs;
- head not off-set;
- esophageal gland overlapping the intestine dorsally;
- lateral field with four incisures;
- monovarial
- vulva close to the anus, sub-terminal
|
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Mature Females:
Saccate (0.8 to 1.4 mm long and 0.2 to 0.45 mm wide).
Nacobbus dorsalis differs
from N. aberrans
in the number of annules
between vulva and anus (VA = 8-14 in N. dorsalis
compared to VA = 15-24 in
N. aberrans)
and a more posterior vulval position in the immature females (94-97%
compared to 91-94 %, respectively). Mature N. dorsalis
females are rounder compared
to the spindle-shaped N. aberrans
females.
Posterior of female - vulva and anus (SEM):
Photograph: I. Cid. del Prado
|
| Drawing by Charles S. Papp, CDFA |
|
 |
Males:
Vermiform and of the same body length as females.
Caudal alae
peloderan.
Spicules and gubernaculum. |
In California, this species of false root knot nematode is found occasionally in Kern, King,
Los Angeles, Monterey, Riverside, and San Luis Obispo counties. Mainly on
plants not of agricultural importance.
Mainly reported from non-agricultural plants, and quite rare.
| All juveniles are
migratory endoparasites
and penetrate plant root tips and/or axial roots.
Mature females penetrate roots, become swollen and sedentary, cause
formation of root galls and enlarged cells. |
 |
 |
For an extensive list of host plant species and their susceptibility, copy the
name
Nacobbus
dorsalis
select
Nemabase and
paste the name in the Genus and species box
Eggs are retained in the female body in N. dorsalis.
Life cycle is approximately 48 days at 25 C.
The nematode migrates through plant tissues as a juvenile; it initiates a
gall and becomes sedentary as a young female.
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
Nacobbus dorsalis
select
Nemabase Resistance Search and
paste the name in the Genus and species box
Manzanilla-López, R. H., M. A. Costilla, M. Doucet, J. Franco, R. N. Inserra,
P. S. Lehman, I. Cid del Prado-Vera, R. M. Souza, and K. Evans. 2002. The genus
Nacobbus
Thorne & Allen, 1944 (Nematoda:Pratylenchidae):Systematics,
distribution, biology and management. Nematropica 32:149-227.
Copyright © 1999 by Howard Ferris.
Revised: December 21, 2012
.
