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Entomophaga

, Volume 19, Issue 3, pp 237–242 | Cite as

Trichogramma semblidis [Chalcidoidea: Trichogrammatidae] as a parasite of the bark beetle eggs [Coleoptera: Scolytidae]

  • J. Michalski
  • S. Seniczak
Article

Abstract

It has been found thatTrichogramma semblidis (Aurv.) parasitizes the eggs ofleperisinus fraxini (Panz.),L. orni (Fuchs) andHylesinus crenatus (Fabr.) in typical variant ofCircaeo-AlnetumOberdorfer 1953 in the Laski Experimental Forestry near Kepno. Thorough studies were conducted on exposed European ash logs and split wood in 3 methodical variants. The analysis of the galleries ofLeperisinus fraxini has showed that the average egg infestation amounted to 14.1%, 13.0% and 11.1% respectively. The egg infestation of individual gallery systems in the exposed control logs and split wood ranged between 2.7–51.2%, 1.2–44.1% and 1.7–69.2%, respectively, in different variants and the average effectiveness of the parasite amounted to 12.7% of the host egg mortality in 1970. Earlier observations and analyses of the gallery systems made on the ash trunks and branches in 1967 and 1968 showed 80.0% and 98.0% infestation of the eggs ofL. fraxini and 10.0% and 1.5% infestation of the eggs ofL. orni. Separate developmental stages of the parasite, the behaviour of the latter and penetration of the gallery systems were observed too. The most important data on the host species ofT. semblidis have been compared.

Keywords

Methodical Variant Host Species Bark Beetle Important Data Orni 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

Les auteurs ont constaté le parasitisme deTrichogramma semblidis (Aurv.) sur les œufs deLeperisinus fraxini (Panz.),L. orni (Fuchs) etHylesinus crenatus (Fabr.) dans l'ensemble Circaeo-AlnetumOberdorfer 1953 (variante typique) de la station forestière expérimentale Laski, près de Kepno. Les observations étaient effectuées sur des cylindres et bûches de frêne, dans 3 variantes expérimentales. A la suite de l'analyse des galeries deL. fravini on a noté un niveau moyen de parasitisme de 14,1%, 13,0% et 11,1% des œufs. Le pourcentage des œufs détruits par le parasite, dans les systèmes de galeries individuels, sur les cylindres et bûches, oscillait respectivement entre 2,7–51,2%; 1,2–44,1% et 1,7–69,2%, et l'efficacité parasitaire moyenne était de 12,7% de la mortalité des œufs en 1970. Les observations et les analyses antérieures des galeries sur les troncs et les branches de frêne en 1967 et 1968 ont mis en évidence un parasitisme de 80,0 et 98,0% des œufs deL. fraxini, ainsi que de 10,0 et 1,5% sur des œufs deL. orni. Aussi a-t-on soumis à l'observation les phases du développement du parasite, son comportement et sa pénétration dans les galeries. Les principales informations concernant les espèces hôtes deT. semblidis sont comparées.

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Copyright information

© Le François 1974

Authors and Affiliations

  • J. Michalski
    • 1
    • 2
  • S. Seniczak
    • 1
    • 2
  1. 1.Institute of Forest ProtectionAcademy of AgriculturePoznanPoland
  2. 2.Department of Soil ScienceCopernicus UniversityTorunPoland

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