Abstract
Prevalence of entomopathogenic fungi was studied in overwintering ground beetles (Col.: Carabidae) and rove beetles (Col.: Staphylinidae) collected from fields of lucerne, white cabbage and white cabbage undersown with white clover. In general infection levels in adult ground beetles and rove beetles were low (Carabidae: max. 7.6%,Staphylinidae: max. 7.0%). In comparison, prevalence of entomopathogenic fungi in carabid larvae was high (19–50%). At one study site an epizootic ofBeauveria bassiana was observed, infecting 67% of the staphylinidAnotylus rugosus and 37% of the staphylinidGyrohypnus angustatus. Beauveria bassiana was the predominant fungus isolated from ground beetles and rove beetles from all studied sites. Other fungal species included the hyphomycetesMetarhizium anisopliae, Paecilomyces farinosus andVerticillium lecanii as well asZoophthora radicans andZoophthora philonthi (Zygomycetes: Entomophthorales). Two individuals ofAnotylus rugosus were found to have a dual infection ofZoophthora philonthi andBeauveria bassiana.
Résumé
La présence de champignons entomopathogènes a été recherchée chez des carabes (Col.: Carabidae) et des staphylins (Col.: Staphylinidae) récoltés dans des champs de luzerne, de chou et d'une culture mélangée chou-trèfle blanc. Chez les adultes, le taux d'infection dans les deux groupes d'insectes est en général très faible (Carabidae: max. 7,6%, Staphylinidae: max. 7%). Chez les larves de carabes par contre, le taux d'infection par les champignons est élevé (19–50%). Sur l'un des sites de l'étude, une épizootie àBeauveria bassiana a été observée, l'infection portant sur 67% des individus récoltés appartenant à l'espèceAnotylus rugosus et 37% desGyrohypnus angustatus. B. bassiana est le champignon prédominant isolé à partir des coléoptères de tous les sites étudiés. D'autres espèces fongiques ont été relevées: ce sont les hyphomycètesMetarhizium anisopliae, Paecilomyces farinosus etVerticillium lecanii ainsi queZoophthora radicans etZoophthora philonthi. Deux individus d'A. rugosus ont été retrouvés infectés à la fois parErynia etB. bassiana.
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Steenberg, T., Langer, V. & Esbjerg, P. Entomopathogenic fungi in predatory beetles (Col.: Carabidae andStaphylinidae) from agricultural fields. Entomophaga 40, 77–85 (1995). https://doi.org/10.1007/BF02372683
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DOI: https://doi.org/10.1007/BF02372683