Rotylenchus buxophilus

 

Contents

 

Rev 08/03/2020

  Classification Hosts
Morphology and Anatomy Life Cycle
Return to Rotylenchus Menu Economic Importance Damage
Distribution Management
Return to Hoplolaimidae Menu Feeding  References
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Classification:

       Tylenchina
        Tylenchoidea
         Hoplolaimidae
          Hoplolaiminae


           Rotylenchus robustus Golden 1956

       Synonyms:
          Gottholdsteineria buxophila (Golden, 1956) Andrassy, 1958
Helicotylenchus buxophilus (Golden, 1956) Perry, 1959
Rotylenchus sheri Jairajpuri, 1964
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Morphology and Anatomy:

 

Female: 

Nematode is 1.1 mm long.

  • Body forms an open spiral when relaxed.
  • Cuticle with distinct striations, averaging 1.6 m wide near middle, subcuticular striations half as wide as those of the cuticle.
  • Lateral fields with 4 incisures, areolated only in esophageal region.
  • Lip region hemispherical, not distinctly offset, but a slight constriction separates it from the body contour, consists of 4 to 5 annules; last labial annule marked by 22-28 longitudinal striae giving it a crenate appearance.
  •  Labial sclerotization strong; outer margins of framework inwardly concave.
  •  Spear well developed; anterior tapering portion almost half its length; basal knobs rounded.
  • Dorsal esophageal gland opening inconspicuous, 5-7 m behind base of spear.
  •  Esophagus typical, median bulb oval to rounded; esophageal glands forming a short compact lobe on dorsal and dorso-lateral sides of intestine, dorsal gland anterior to and with larger nucleus than those of subventrals.
  • Esophago-intestinal junction with an oval valvular structure.
  • Excretory pore opposite esophago-intestinal junction or in the region of the esophageal glands, 73-83 annules behind the lip region.
  • Hemizonid 2-4 annules long, 0-4 annules anterior to excretory pore.
  • Hemizonion 1 annule long, 9-11 annules behind excretory pore.
  • Vulva a transverse slit; epiptygma double, not protruding through vulva.
  • Spermatheca inconspicuous, without sperms.
  • Diovarial, amphidelphic, usually lying on one side of intestine; oocytes in a single row, except for a few in germinal zone.
  • Uterine eggs 76 m x 23 m.
  • Rectum not conspicuous, partially overlapped by intestine.
  • Tail dorsally convex-conoid to a slight terminal rounded projection, with 12-18 annules on its ventral side, as long as or slightly longer than anal body-width.
  • Phasmid seen as a small dot in center of lateral field, 6-13 annules anterior to anus.

 

Male:

Male unknown












Ref: CIH Descriptions of Plant-parasitic Nematodes, Set 4, No. 55 (1974)

 

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

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Distribution:

Throughout the U.S. on boxwood, vegetables, stawberries, rye, and a wide variety of ornamentals; in Riverside (California) and Southeastern U.S. on eucalyptus; in Taiwan on sugarcane.


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Economic Importance:

 

 

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Feeding:

Ectoparasitic.

 

 

Photomicrograph by U. Zunke

Migratory ectoparasite; becomes partially embedded in host root. Causes necrotic lesions several cells deep in cortex. Small feeder roots are most heavily attacked along the sides and, occasionally, the nematodes are seen within the root-tips.

 

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Hosts:

 Boxwood, eucalyptus, vegetables, grasses, ornamentals.

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

 

[Ref: CIH Descriptions of Plant-parasitic Nematodes, Set 4, No. 55 (1974)]

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Damage:


Causes stunted, non-vigorous plants with reduced root systems. Parasitized plants become more prone to damage by adverse weather conditions and to attacks by microorganisms.

 

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Management:

No information available.  See methods for the control of Rotylenchus robustus.

Resistance

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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References:

CIH Descriptions of Plant-parasitic Nematodes, Set 4, No. 55 (1974)

 
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Copyright © 1999 by Howard Ferris.
Revised: August 03, 2020.