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NOTES ON TAXONOMY AND BIOLOGY: Female M. decalineata have a cuticular perineal pattern with striae that are close, evenly spaced and a distinct tail whorl, which is fairly distant from the vulva. Males have a lateral field marked by 10 evenly spaced incisures. This root-knot nematode has sedentary endoparasitic habits. Second-stage juveniles (J2) in the soil penetrate host roots where they establish a specialized feeding site (giant cells) in the stele. As J2 develop, they cause small and rounded root swellings and become swollen females, which produce egg masses protruding from the root surface (Whitehead, 1968).
GEOGRAPHICAL DISTRIBUTION: This species has been reported in Tanzania and Sao Tome and Principe.
HOSTS: Coffee (Coffea arabica and C. canefora).
CROP LOSSES: Decline and dieback of coffee trees are associated with nematode infection in Tanzania. However nematode damage caused by this nematode on coffee has not been quantified.
MEANS OF MOVEMENT AND DISPERSAL: Through root material, soil debris, and infected bare root propagative plant material.
RATING: (VL) Taking into consideration the limited distribution of this nematode and the low chance of its introduction in the US, the risk posed by this root-knot nematode to the United States is rated very low.
REFERENCES:
CAB International. 2001. Meloidogyne decalineatain
Crop protection compendium, global module, 3rd edition. Wallingford, UK:
CAB International.
Campos, V, P. Sivapalan, and N. C. Gnanapragasam.
1990. Nematode parasites of coffee, cocoa, and tea. Pp. 387-430 in
M. Luc, R. A. Sikora, and J. Bridge eds. Plant parasitic nematodes in tropical
and subtropical agriculture. Wallingford, UK: CAB International.
Whitehead, A. G. 1968. Taxonomy of Meloidogyne
(Nematoda: Heteroderidae) with descriptions of four new species. Transaction
of the Zoological Society of London 31:263-401.