Longidorus ferrisi




Rev 11/19/2019

Needle Nematode Classification Hosts
Morphology and Anatomy Life Cycle
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           Longidorus ferrisi Robbins, Ye & Pedram, 2009

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Morphology and Anatomy:



Body spiral to J shaped upon heat relaxation, tapering toward both ends.

Lateral hypodermal chords visible throughout the length of the


Head flattened with rounded sides; 16 to 19 µm wide.

Amphidial pouches symmetrically bilobed, deeply indented.

Odontophore long and slender, base not flanged.

Esophagus dorylaimoid with cylindrical basal esophageal bulb.

Cardia conoid at the junction of the esophageal bulb.

Reproductive system diovarial, amphidelphic, ovaries reflexed.

Sperm observed in all uteri.

 Tail short, conoid dorsally and less so ventrally, with rounded terminus.

Source: Robbins et al., 2009

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

Drawings and photomicrographs by Robbins et al., 2009

Similar to female in size and shape;
more strongly curved tail.

 Spicules well developed, arcuate.

Supplements one adanal pair and a ventromedian series of seven to 11.

Tail one anal body width or less in length, dorsally convex, ventrally concave, terminus bluntly rounded.

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Found in hills bordering western edge of Napa Valley, California.  Moist soil location from natural spring.


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Economic Importance:

D-rated pests in California. 


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Ectoparasite on roots.

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Probably on citrus; found on soil surrounding roots of an excavated citrus tree.

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

Males and females present in population in approx 1:1 sex ratio..

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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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Robbins, R.T., Ye< W. & Pedram, M. 2009. Longidorus ferrisi n.sp. from California citrus.  Journal of Nematology 41:104-110.
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Copyright © 1999 by Howard Ferris.
Revised: November 19, 2019.