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Entomophaga

, Volume 24, Issue 3, pp 229–235 | Cite as

Pathologie d’une microsporidiose de l’arpenteuse du chou,Trichoplusia ni [Lep.: Noctuidae], parVairimorpha necatrix

  • Wei Hsuang Chu
  • R. P. Jaques
Article

Résumé

Les larves deTrichoplusia ni (Hübner) infectées parVairimorpha (=Nosema) necatrix (Kramer) présentent des symptômes chroniques, semi-chroniques et aigus selon les doses de spores deV. necatrix (5 à 500, 5.103 à 5.105 et 5.106 par larve, respectivement) ingérées par larve.V. necatrix parasite principalement le corps adipeux et les tissus des muscles quand les larves ont des symptômes chroniques, tandis que les larves manifestent les symptômes aigus lorsque les microsporidies attaquent principalement l’intestin moyen. L’histopathologie de la maladie est étudiée.

Summary

Infection of larvae ofTrichoplusia ni (Hübner) byVairimorpha, (=Nosema) necatrix was classified as chronic, semi-chronic and acute symptoms depending on the quantity of spores (5 to 500, 5×103 to 5×105, and 5×106 per larva, respectively) ingested per larva.V. necatrix infects mainly the fat body and some muscle tissue of larvae with chronic symptoms and mainly midgut tissue of larvae with acute symptoms.V. necatrix caused death in 3 to 4.5 days when a larva ingested 5×106 spores. The histopathology of the disease was studied.

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Copyright information

© Le François 1979

Authors and Affiliations

  • Wei Hsuang Chu
    • 1
  • R. P. Jaques
    • 1
  1. 1.Research StationAgriculture CanadaHarrowCanada

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