Globodera tabacum |
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Rev 11/13/2008 |
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| Tobacco cyst nematode |
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Classification |
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Hosts |
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Morphology and Anatomy |
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Life Cycle |
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Economic Importance |
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Damage |
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Distribution |
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Management |
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Feeding |
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References |
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Classification:
- Tylenchida
Tylenchina
Tylenchoidea
Heteroderidae
Heteroderinae
- Globodera tabacum
Tobacco Cysts Nematode
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Morphology and Anatomy:
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Females: Cyst stage present.
Body globose, spheroidal, with a short neck and no terminal cone.
All eggs retained in body (no egg-mass).
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| Cysts of Globodera tabacum |
| Males: Vermiform; body twisted into a C or S shape.
Lateral field with four lines. Spicules greater than 30 µm in length, distally pointed. No cloacal tubus. Tail short, hemispherical. |
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Second-stage juveniles: Stylet less than 30 µm long. Lateral field with four lines. Esophageal glands filling body cavity. Tail conical, pointed, with terminal half hyaline.
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Distribution:
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Economic Importance:
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Feeding:
Sedentary semi-endoparasite of roots
Feeding site and feeding patterns typical of genus Globodera.
Nurse cell system is a multinucleate syncytium.
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Hosts:
Tobacco and other Solanaceae.
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Life Cycle:
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| White females and cysts of Globodera tabacum on root surface. |
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Damage:
Stunted tobacco plants in a field infested with G. tabacum.
Photograph by J.A. Fox, VPI.
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Management:
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References:
Luc, Maggenti & Fortuner, Rev. Nematol. 11(2):159-176 (1988)