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Interactions between the fungal pathogen Beauveria bassiana and three species of ladybird: Harmonia axyridis, Coccinella septempunctata and Adalia bipunctata.

Roy, Helen Elizabeth; Brown, Peter M. J.; Rothery, Peter; Ware, Remy L.; Majerus, Michael E. N.. 2008 Interactions between the fungal pathogen Beauveria bassiana and three species of ladybird: Harmonia axyridis, Coccinella septempunctata and Adalia bipunctata. BioControl, 53 (1). 265-276. 10.1007/s10526-007-9122-0

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Abstract/Summary

Harmonia axyridis is a predatory coccinellid, native to central and eastern Asia. It has been available in many countries for use as a biological control agent of pest aphids and scale insects. In many of these countries, including the USA, H. axyridis has established. It is now considered an invasive alien species for a number of reasons, including its impact on functional biodiversity. Beauveria bassiana is known to be a natural mortality agent of overwintering coccinellids and is a potential candidate for the biological control of H. axyridis. In this paper we compare the susceptibility of three species of coccinellid, H. axyridis (cultures derived from Japan and Britain), Coccinella septempunctata and Adalia bipunctata to infection by B. bassiana (commercial strain GHA) after exposure at three doses (105, 107, 109 conidia ml–1). The two subpopulations of H. axyridis (Japanese and British) were more resistant to B. bassiana infection than either A. bipunctata or C. septempunctata. This is exemplified by the median lethal doses at 10 days post-inoculation (LD50) of 106.2, 106.0, 108.3, 109.6 conidia ml–1 for A. bipunctata, C. septempunctata, H. axyridis (Japanese) and H. axyridis (British), respectively. Only doses of 109 conidia ml–1 resulted in mortality of H. axyridis, in contrast, 80% of C. septempunctata and 70% of A. bipunctata exposed to 107 conidia ml–1 of B. bassiana succumbed to infection. The fecundity (cumulative mean egg production over 10 days) of A. bipunctata and H. axyridis (UK) was also assessed. The fecundity of C. septempunctata could not be assessed because this species requires diapause prior to the onset of reproduction and these studies were on beetles that had recently eclosed (2–8 weeks). Harmonia axyridis (Japan) produced no eggs in most treatments including the control and so was excluded from analysis. High dose (109 conidia ml–1) inoculation reduced the fecundity of A. bipunctata to zero but egg production was similar for individuals inoculated with doses of 105, 107 conidia ml–1 and control individuals. In contrast, all doses of B. basssiana reduced H. axyridis (UK) egg production dramatically. We discuss these results in relation to the potential for control of H. axyridis using B. bassiana.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s10526-007-9122-0
Programmes: CEH Programmes pre-2009 publications > Biodiversity > BD01 Conservation and Restoration of Biodiversity
CEH Programmes pre-2009 publications > Biodiversity > BD02 An Integrated Framework for the Sustainable Management of Biological Introductions - Alien Species and Emerging Diseases
CEH Sections: Pywell
ISSN: 1386-6141
Additional Information. Not used in RCUK Gateway to Research.: The original publication is available at www.springerlink.com.
Additional Keywords: Beauveria bassiana, Harmonia axyridis, Coccinella septempunctata, Adalia bipunctata, Fungal entomopathogen, Coccinellidae, Invasive alien species, Native species, Biological control, Harlequin ladybird
NORA Subject Terms: Zoology
Ecology and Environment
Related URLs:
Date made live: 01 Apr 2008 12:25
URI: http://nora.nerc.ac.uk/id/eprint/2453

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