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Entomophaga

, Volume 32, Issue 1, pp 39–47 | Cite as

Bioecologie deEubazus semirugosus, coeloïdes abdominalis etC. sordidator [Hym.: Braconidae] parasites dePissodes notatus [Col.: Curculionidae] dans le sud de la France

  • C. Alauzet
Article

Résumé

Cette étude porte sur différents aspects de la biologie deE. semirugosus, C. sordidator etC. abdominalis, se développant surP. notatus, ravageur du Pin maritime: comportement parasitaire à l'égard de ce charançon, durée du développement, durée de la maturation sexuelle, espérance de vie des adultes, etc. Le cycle biologique de ces parasitoïdes est étudié ainsi que le problème de la coïncidence temporelle entre ces braconides et leur hôte dans le cas d'une forêt du sud de la France.

Mots clefs

Pinus pinaster Pissodes notatus Eubazus semirugosus Coeloïdes sordidator Coeloïdes abdominalis parasitisme cycle biologique 

Summary

This study shows thatE. semirugosus is an endophagous egg-larval parasitoid ofP. notatus. After hatching, the parasitoid larva develops in thePissodes larva until the host has formed the pupal chamber. Therefore the complete development of this wasp is conditioned by the speed of the host development. In suitable laboratory conditions (19°C) or in the forests of southern France during the summer, the development requires approximately 2 months but is slower when the temperature is lower as in winter. Consequently, onP. notatus this braconid shows 2 generations a year, the 1st one emerging from April to the beginning of June and the 2nd one from the end of June up to mid-August.

C. abdominalis andC. sordidator are observed as ectoparasites mainly on the 2nd and 3rd stages ofP. notatus, occasionally on the 4th one. At 19°C, the complete development requires 1 month. In field conditions the emergences occur continuously from April to August but arise from 4 successive overlapping broods, the 1st one resulting from diapausing pupae that appear in September and overwinter until spring.

Despite the plurivoltinism manifested by these 3 parasitoids, their population sizes have always remained low. The main factor responsible for this weak parasitization effect onP. notatus is the unavailability of suitable host-stages when the females become able to oviposit, i.e. about 1 week after their emergence.

Key-words

Pinus pinaster Pissodes notatus Eubazus semirugosus Coeloïdes sordidator Coeloïdes abdominalis parasitism life cycle 

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Copyright information

© Lavoisier Abonnements 1987

Authors and Affiliations

  • C. Alauzet
    • 1
  1. 1.Laboratoire d'EntomologieUniversité Paul SabatierToulouse CedexFrance

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