Meloidogyne daklakensis

Meloidogyne daklakensis	Contents	Rev 12/16/2024
Dak Lak Coffee Root-knot Nematode	Classification	Hosts
	Morphology and Anatomy	Life Cycle
Return to Meloidogyne Menu	Economic Importance	Damage
	Distribution	Management
Return to Meloidogynidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

      Chromadorea
       Rhabditida
       Tylenchina
        Tylenchoidea
          Meloidogynidae
           Meloidogyninae

Meloidogyne daklakensis Trin, Le, Nguyen, Nguyen, Liebanas, Nguyen, 2019

Review general characteristics of the genus Meloidogyne.

Morphology and Anatomy:

Female:

Body pearly white, pear-shaped; anterior end pointed; posterior end varying from rounded to slightly flattened.
Neck usually short, not curved.
Stoma slit-like; lip region sclerotized and slightly offset from rest of body, bearing one annulus; labial disc not fused with medial lips, elevated; lateral sectors enlarged, extension prominent.
Amphidial openings elongated.
Stylet short, cone base triangular and wider than shaft. Stylet tip normally straight, shaft cylindrical, same diameter throughout its length. Three stylet knobs, oval and sloping posteriorly. Distance from stylet base to DEGO 5 Â± 0.2 um.
Pharyngeal lumen of procorpus wide, often showing rounded protuberances.
Excretory pore within range of procorpus to metacorpus.
Metacorpus large and rounded, valve apparatus oval-shaped and sclerotized.
Perineal patterns of females rounded to oval; striae smooth, regular and continuous; lateral lines reduced, resulting in appearance of thick prominent lateral part in SEM; dorsal arch low, rounded and encloses distinct vulva, anus and tail tip.
Phasmids indistinct.
Vulva slit centrally located in the unstriated area, and longer than the distance between vulva and anus.

Male:

Body vermiform, anterior end tapering and posterior region bluntly rounded.
Lip region slightly offset from body, with a high lip region cap consisting of a large labial annulus. Medial lips and labial disc are bow-tie shaped. Lateral lips large and triangular, slightly lower than labial disc and medial lips.
Amphidial openings appear as long, wide slits located between labial disc and lateral lips.
Post-labial annulus divided into four lobes by longitudinal slits.
Stylet robust and straight, one lateral knob projected, two others sloping posteriorly.
Distance from base of stylet to DEGO 5Â±1 um.
Procorpus distinctly outlined, three times longer than metacorpus. Metacorpus ovoid, with a strong valve apparatus.
Excretory duct curved.
Lateral field with four incisures forming three bands, areolation along whole body.
One testis, occupying 58% of the body cavity.
Spicules slightly curved ventrally, with bluntly rounded terminus. Gubernaculum short and crescent-shaped

(Ref: Trin et al., 2019)

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

Distribution:

Described from Robusta coffee in the Western Highlands of Vietnam

Coffee roots display symptoms that are atypical of those caused by other root-knot nematodes. There is a large number of egg masses protruding outside the roots, and numerous small, white galls on adventitious roots (Trin et al., 2019).

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Feeding:

Sedentary endoparasite.

Feeding site establishment and development typical of genus.

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Hosts:

Type host: Coffea canephora.(Robusta coffee)

For an extensive host range list for this species, click

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Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

Sedentary endoparasites.

Female body ruptures root cortex and may protrude with the egg mass on the root surface.

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Damage:

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Management:

Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

For plants reported to have some level of resistance to this species, click

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References:

Subbotin, S.A., Palomares-Rius, J.E., Castillo, P. 2021. Systematics of Root-knot Nematodes (Nematoda: Meloidogynidae). Nemaology Monographs and Perspectives Vol 14. Brill, Leiden. 857p.

Trin, Q.P., Le, T.M.L., Nguyen, T.D., Nguyen, H.T., Liebanas, G., Nguyen, T.A.D. 2019. Meloidogyne daklakensis n. sp. (Nematoda: Meloidogynidae), a new root-knot nematode associated with Robusta coffee (Coffea canephora Pierre ex A. Froehner) in the Western Highlands, Vietnam. J. Helminthology 93:242-254