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Heterodera carotae Jones
Nematoda, Tylenchida, Heteroderidae .

Carrot root nematode, Carrot cyst nematode

Description, Biology, Life Cycle, Damage, Common Names, Images

This species is a cyst nematode. Males are thread-like and about 1.5 mm long in the adult stage. After fertilization, females change into a white and later brown cyst having the shape of a lemon, each cyst containing 200-600 eggs.

- This species is restricted to carrot.
- These small nematodes gain entry to the roots, either by piercing the epidermis with their stylet or by through wounds. They extract the contents of cells and inject toxins, thus destroying cells.
At the time of reproduction, females swell and make the bark of radicles burst, their head remaining attached to the plant (*) .

[R]Life Cycle
- This nematode shows a high ability to multiply and, in the presence of suitable hosts, numbers can increase tenfold at each crop.

- In the field, the presence of this nematode is indicated by patches of irregular plant growth which enlarge from one year to the next if crops remain susceptible due to rotation.
- Affected carrots are small. Radicles are abnormally developed and numerous, which gives to the roots a characteristic bearded appearance (*) . The stunted and reddish foliage may dry out in case of heavy attacks (*) .

[R]Common Names
DE: Möhrenälchen, Möhrenzystenälchen ES: Nemátodo de la zanahoria FR: Nématode de la carotte IT: Nematode della carota PT: Heterodera da cenoura GB: Carrot root nematode, Carrot cyst nematode

[R] Images

  1. Heterodera carotae (Jones) (ACTA)
    Attack on carrot
  2. Heterodera carotae (Jones) (BASF)
    Comparison between healthy and affected carrots
  3. Heterodera carotae (Jones) (BASF)
    Damage on crop of carrot

To read this page in French

HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.

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