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Contrasting olfactory responses of two egg parasitoids to buckwheat floral scent are reflected in field parasitism rates

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Abstract

Conservation biological control programs advocate the planting of flower strips alongside crops to improve the survival and effectiveness of parasitoids. Ideally, the provided food plants are highly attractive and benefit the targeted biocontrol agents without promoting pests or intraguild competition. Previous laboratory studies showed that Trissolcus basalis, an egg parasitoid of the stink bug Nezara viridula, is highly attracted to floral odors of buckwheat and that its nectar increases the wasp’s fecundity. In the field, T. basalis competes with the co-occurring parasitoid Ooencyrtus telenomicida for host eggs. Therefore, in the present study, we explored whether O. telenomicida shows similar attraction to buckwheat volatiles. We then carried out a 2-year field experiment to assess whether the laboratory-observed olfactory behaviors of both species are reflected in changed parasitism rates of stink bug eggs. Parasitism by naturally occurring egg parasitoids was measured in tomato plots with and without a margin of flowering buckwheat. Our results showed that, unlike T. basalis, O. telenomicida was repelled by the odor of buckwheat flowers. In both years, T. basalis found more egg batches and parasitized more stinkbug eggs when flower margins were present. Egg parasitism correlated positively with proximity to the buckwheat margin. In accordance with our prediction, egg parasitism by O. telenomicida occurred almost exclusively in the control plots and for a shorter period during the season. We conclude that buckwheat strips can influence intraguild competition and hypothesize that the effect was mediated by floral volatiles.

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Author Contributions

MCF, EP, SC, and MR contributed to the design and implementation of the research; MCF acquired field data; MCF and EW analyzed the results. All authors discussed the results and wrote the final manuscript.

Acknowledgements

The authors thank Edgardo Foti for providing fields and for assistance in the management of the crop and flowering plants. We thank Janine Johnson for copyediting the manuscript. This research was partially supported by the Marie Skłodowska-Curie Research and Innovation Staff Exchange (RISE) H2020-MSCA-RISE-2015 of the European Union with the project Impact of invasive alien true bug species in native trophic webs—INVASIoN (GA 690952).

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Correspondence to Maria Cristina Foti.

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The authors declare that they have no conflict of interests regarding this research.

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Informed consent was obtained from all individual participants included in the study.

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This article does not contain any studies with human participants or animals (vertebrates) performed by any of the authors.

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Communicated by S. Macfadyen.

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Foti, M.C., Peri, E., Wajnberg, E. et al. Contrasting olfactory responses of two egg parasitoids to buckwheat floral scent are reflected in field parasitism rates. J Pest Sci 92, 747–756 (2019). https://doi.org/10.1007/s10340-018-1045-2

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  • DOI: https://doi.org/10.1007/s10340-018-1045-2

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