Abstract
The vinegar fly Drosophila suzukii (Matsumura) is an invasive species that attacks ripening fruits and berries, leading to considerable losses in fruit production. So far, management mainly relies on chemical and cultural control, but additional measures such as biological control are needed. Hence, for the development of sustainable control measures of this pest it is important to identify potential natural enemies such as generalist predators that feed on D. suzukii. Here, we established a simple and cost-effective assay to specifically detect D. suzukii DNA in the guts of arthropod predators. Furthermore, we developed a general Drosophila spp. primer pair to identify predators of Drosophila species in general that might also feed on D. suzukii and to compare predation rates on D. suzukii to those of other Drosophila species. We applied the assays to field-collected predators and identified three predator taxa—earwigs, spiders and predatory bugs—that had fed on D. suzukii. The assays provide a first step towards unravelling the predator community attacking D. suzukii that should be considered as biological control agents but also as non-targets potentially affected by other measures to control this invasive pest.
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Acknowledgements
This work was funded by the Drosophila suzukii R & D Task Force funded by the Swiss Federal Office for Agriculture (FOAG). Additional support for molecular analysis by Agroscope is gratefully acknowledged. The authors thank Gerhard Bächli for providing specimens of drosophilids and for his assistance in identifying Drosophila species. We are grateful to Serge Fischer (Agroscope), Pierre Girod (CABI), Steffen Hagenbucher (Wildbiene und Partner) and Florian Steiner (University of Innsbruck) for providing specimens of Drosophila species. We thank Alexander Rief (University of Innsbruck) for his assistance in identifying spiders. We also thank Sara D’Alessio and Daniel Hauser (Agroscope) for their help in the field survey. Moreover, many thanks go to the farmers and neighbours that allowed us to collect predators in their cultures. We also want to thank the three anonymous reviewers for their valuable comments that helped improve the manuscript.
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Wolf, S., Zeisler, C., Sint, D. et al. A simple and cost-effective molecular method to track predation on Drosophila suzukii in the field. J Pest Sci 91, 927–935 (2018). https://doi.org/10.1007/s10340-017-0948-7
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DOI: https://doi.org/10.1007/s10340-017-0948-7