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NOTES ON TAXONOMY AND BIOLOGY: Female M. donghaiensis have a rounded cuticular perineal pattern marked by coarse and fine striae. Dorsal arch is low or moderately high. Lateral lines are indistinct (Zheng et al., 1990). This root-knot nematode has sedentary endoparasitic habits. Second-stage juveniles (J2) penetrate host roots where they establish a specialized feeding site (giant cells) in the stele. As 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 (Zheng et al., 1999; Vovlas and Inserra, 1996).
HOSTS: Meloidogyne donghaiensis infects and reproduces on citrus such as mandarine (Citrus reticulata). 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 infected 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.
REFERENCES:
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.
Zheng, L., M. Lin, and M. Zheng 1990. Occurrence
and identification of a new disease of the citrus, Donghai root-knot nematode-
Meloidogyne
donghaiensis sp. nov. in coast soil of Fujian, in China. Journal of
Fujian Academy of Agricultural Sciences 5 (2): 56-63.