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Ribosomal RNA phylogeny of bacterial and fungal pathogens of Agriotes wireworms

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Abstract

Wireworms, the polyphagous larvae of click beetles belonging to the genus Agriotes (Coleoptera: Elateridae), are severe and widespread agricultural pests affecting numerous crops. Biological control agents and methods for this general pest are highly solicited. In a screening for microbial Agriotes pathogens, an intracellular bacterium and a mitosporic fungus were isolated. Phylogenetic analysis based on ribosomal RNA operon sequences of both micro-organisms corroborated their previous morphology-based taxonomic classification. The bacterial pathogen has been assigned to the taxonomic genus Rickettsiella (Gammaproteobacteria) wherein it represents a new pathotype, ‘Rickettsiella agriotidis’, that appears most closely related to subjective synonyms of the nomenclatural type species, Rickettsiella popillae. The fungal pathogen has been shown to belong to the form-species Beauveria bassiana, i.e., an obligate anamorph related to the genus Cordyceps (Ascomycota: Hypocreales). Furthermore, the B. bassiana strain from Agriotes has been shown to be potentially susceptible to identification by gIi-diagnosis, i.e., a diagnostic method making use of the strain-specific presence of self-splicing group-I introns within the ribosomal RNA operons of certain hyphomycetous fungi.

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Correspondence to Regina G. Kleespies.

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Communicated by M. Traugott

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Leclerque, A., Mitkovets, P.V., Fatu, AC. et al. Ribosomal RNA phylogeny of bacterial and fungal pathogens of Agriotes wireworms. J Pest Sci 86, 107–113 (2013). https://doi.org/10.1007/s10340-012-0450-1

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  • DOI: https://doi.org/10.1007/s10340-012-0450-1

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