Abstract
A leaf beetle, Crioceris sp. (Coleoptera: Chrysomelidae), was introduced into Australia as a biological control agent of bridal creeper (Asparagus asparagoides L. Druce) during October 2002. Rearing of Crioceris sp. is labour intensive therefore all releases of Crioceris sp. have been under 1000 individuals, which may be too low to ensure establishment if high mortality and high competition with other agents occurs. The aim of this study is to understand how the presence of two well-established biocontrol agents, a rust fungus (Puccinia myrsiphylli (Thuem) Wint [Basidiomycota: Uredinales]) and a leafhopper (Zygina sp. [Hemiptera: Cicadellidae]), might influence Crioceris sp. establishment. Crioceris sp. neonate larvae were placed on bridal creeper plants with or without the leafhopper and/or rust. The number of larvae that pupated was reduced by 38 and 65% in the presence of the rust fungus and leafhopper, respectively and by 45% in the presence of both agents. As the area infected by the rust increased the area damaged by the leafhopper decreased. The rust appeared to be negatively impacted by the presence of the leafhopper. In a second experiment, female Crioceris sp. adults were given a choice between uninfested bridal creeper plants and those infested with the rust or the leafhopper. The females preferred to lay their eggs on plants without leafhoppers but did not seem to be deterred by the presence of the rust. Consequently, the performance and impact of Crioceris sp. on bridal creeper may be reduced if populations overlap with the other biocontrol agents in the field.
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Acknowledgements
CSIRO Entomology (Floreat, WA) is gratefully acknowledged for allowing us to use their glasshouse and laboratory facilities. We thank L. Morin for allowing us to use the pictorial key of rust infection she developed (Louise.Morin@csiro.au). The School of Animal Biology provided financial assistance. We thank two anonymous reviewers for their helpful comments in improving this manuscript.
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Spafford Jacob, H., Reilly, T.E. & Batchelor, K.L. The presence of Zygina sp. and Puccinia myrsiphylli reduces survival and influences oviposition of Crioceris sp.. Biocontrol 52, 113–127 (2007). https://doi.org/10.1007/s10526-006-9012-x
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DOI: https://doi.org/10.1007/s10526-006-9012-x