Abstract
The predator Aphidoletes aphidimyza (Rondani) (Diptera: Cecidomyiidae) and the generalist entomopathogenic fungus Metarhizium brunneum Petch (Hypocreales: Clavicipitaceae) are effective biological control agents that can co-occur in pest management programmes. We exposed larvae to M. brunneum, on leaves and in soil, to explore possible outcomes of combining the two natural enemies. The number of emerging adults and their longevity were negatively affected by fungus in the soil. When exposed on leaves, adult emergence was unaffected but longevity was reduced. In choice experiments, females chose to lay eggs on fungus-free leaves: more control leaves had eggs and there were more eggs per leaf in the control. In no-choice experiments, the same frequency of females laid eggs in the treatment and control, but significantly more eggs were laid on the control leaves. Gravid A. aphidimyza can perceive M. brunneum and respond by choosing fungus-free oviposition sites, thus reducing contact between them.
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Acknowledgements
The study was part of the EU project INBIOSOIL (Grant agreement 282767), funded by means of the 7th Framework Programme of the European Union. The authors would like to thank Erik W. Hansen and Desislava Dimitrova, EWH BioProduction for the cohorts; the laboratory technician Kristian Hanse; Judith K. Pell for the support with the proofreading. We also thank two anonymous reviewers for comments that helped us improve a previous version of this manuscript. This study was supported by the EU FP7 INBIOSOIL project and Science without Borders—Brazil (1260-13-8).
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de Azevedo, A.G.C., Stuart, R.M. & Sigsgaard, L. Presence of a generalist entomopathogenic fungus influences the oviposition behaviour of an aphid-specific predator. BioControl 63, 655–664 (2018). https://doi.org/10.1007/s10526-018-9889-1
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DOI: https://doi.org/10.1007/s10526-018-9889-1