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Javanese Root Knot Nematode

Scientific Name
Meloidogyne javanica
Scientific Author
(Treub, 1885) Chitwood, 1949
Taxonomy
(Nematoda: Aphelenchida: Meloidogynidae: Meloidogyninae)
Pest Status
0 Unknown
Status
NZ - Exotic
Reliability
High
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Diagnostic Images (6)
Diagnostic Notes
Description of Female

Body is pear-shaped and the distinct neck is in line with the posterior end. Egg masses often protrude from the gall, but the females are usually completely embedded within plant tissue. Stylet is 14-18 µm, the opening is near the tip (0.5 µm) and is marked by a slight protuberance posteriorly. The shaft is cylindrical and broadens near the base. The large, transversely elongate knobs are set off from the shaft and are often marked anteriorly by a shallow indentation. The distance from the DEGO to the stylet knob base is variable (2-5 µm).

The perineal pattern is often very diagnostic for the species because many specimens have distinct lateral lines that clearly delineate the dorsal and ventral regions of the pattern. Patterns that resemble those of M. arenaria and M. incognita can be easily identified as M. javanica by the presence of distinct lateral lines. The overall shape of the perineal pattern is round or oval to slightly squarish.

Description of Male

The shape of the head of M. javanica is unique fro the species in lateral view in the LM. The labial disk and medial lips form one smooth continuous head cap that is high and rounded and distinctly set off from the head region. The head shape of males of M. javanica is similar to that of several other species, namely, M. exigua, M. graminis, M. naasi, M. graminicila, M. krali, and others. The head cap of M. javanica is slightly higher and more rounded. The stylet of the male is unique for the species and is useful for separating M. javanica males from the other species with similar head shapes. The cone is bluntly pointed. In many species the stylet opening is long and slit-like and lies some distance (3-4 µm) from the porint. The transversely elongate, broad knobs are distinctly set off from the shaft. The distance of the dorsal gland orifice to the base of the knobs is relatively short (2-4 µm).

Second-stage Juvenile

The body length of preparasitic juveniles is 402-560 µm (488 µm), and the tail is 51-63 µm (56 µm). The hyaline tail terminus is 9-18 (13.7 µm) long.

CABI CPC 2006. Measurements (from Orton Williams, 1972)

20 females: L = 541-804 µm (657); width = 311-581 µm (431); stylet = 14-18 (15) µm width stylet base (10) = 2-5 µm (4); dorsal oesophageal gland orifice = 2-5 µm (3) behind stylet base; length median bulb (10) = 38-46 µm (42); width median bulb (10) = 31-44 µm (35); length median bulb valves (10) = 14-19 µm (16); width median bulb valves (10) = 10-13 µm (11).

25 males: L = 757-1297 µm (1131); a = 17.5-42.9 (37.5); length head (24) = 5.8-7.6 µm (6.6); stylet = 20.0-23.0 µm (21.2); width stylet base (24) = 3.6-5.4 µm (4.3); dorsal oesophageal gland orifice (10) = 2.2-4.7 µm (2.9) behind stylet base; b1 = 13.0-18.4 (15.7); c (24) = 50-144 (91); length median bulb = 15.1-23.7 µm (19.7); width median bulb = 9.4-12.9 µm (10.9); spicules (length of arc) (30) = 20.9-31.7 µm (26.7); gubernaculum (14) = 7.2-9.4 µm (8.4).

25 juveniles: L = 387-459 µm (417); a = 27.1-35.9 (30.6); b (16) = 2.10-3.35 (2.42); b1 = 7.1-8.0 (7.5); length tail = 36-56 µm (49); d = 4.5-7.0 (5.5); c = 7.3-11.1 (8.5); length body to middle of genital primordium = 217-282 µm (255); stylet (24) = 9.4-11.4 µm (10.4); length median bulb = 10.8-13.7 µm (12.1); width median bulb = 5.4-7.6 µm (6.6); length median bulb valves (24) = 3.2-5.0 µm (4.3).
More Information
Specimen Contact
MAF Plant Health & Environment Laboratory (Nematode collection held by Zeng Zhao at Landcare Research)
Author
Zhao, Z. Q. & Crosby, T. K.
Created
26/05/2011 07:47 AEST
Last Updated
07/07/2011 06:57 AEST
Citation
Zhao, Z. Q. & Crosby, T. K. (2011) Javanese Root Knot Nematode (Meloidogyne javanica ) Updated on 7/7/2011 6:57:34 AM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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