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Pest Description
IDENTITY: Scientific name: Meloidogyne mingnanica
Zhang, 1993.
 Common name: A citrus root-knot nematode

NOTES ON TAXONOMY AND BIOLOGY: M. mingnanica  females have an ovoidal cuticular perineal pattern with a very distinct inner area, which contains vulva and anus. This area is marked by a few coarse striae in an eight-shaped figure with a large base and a small top marked by fine striae. Dorsal arch is low or moderately high. Lateral lines are indistinct (Zhang, 1993).  This root-knot nematode has sedentary endoparasitic habits. Second-stage juveniles (J2) host roots where they establish a specialized feeding site (giant cells) in the stele. A J2 develop, they cause root swellings and become swollen females. Females rupture root cortex and often protrude from the root surface with egg masses. J2 emerge from the egg masses and migrate in the soil.

GEOGRAPHICAL DISTRIBUTION: This root-knot nematode occurs only in China (Zhang, 1993;Vovlas and Inserra, 1996).

HOSTS: Meloidogyne mingnanica infects and reproduces on citrus spp. such as Satsuma (Citrus unshiu). No other hosts of this nematode are known.

CROP LOSSES: Quantification of the damage induced by this root-knot nematode to citrus in China is not available.

MEANS OF MOVEMENT AND DISPERSAL:  Through root material, soil debris and poorly sanitized bare root propagative plant material.

RATING: (M) A moderate priority rating was given for this nematode, based on consideration given to the economic importance of citrus, a perennial crop, and the limited information available on the host range and pathways of entry for this nematode.

    Vovlas N. and R. N. Inserra. 1996. Distribution and parasitism of root-knot nematodes on citrus. Nematology Circular No. 217, Florida Department of Agriculture and Consumer Services, Division of Plant Industry, Gainesville, FL, USA.
    Zhang, B.1993. Meloidogyne mignanica n. sp. (Meloidogynidae) parasitizing citrus in China. Journal of Fujian Agricultural University (Natural Sciences Edition) 22 (S): 69-76.