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A parasitoid’s dilemma between food and host resources: the role of volatiles from nectar-providing marigolds and host-infested plants attracting Aphidius platensis

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Abstract

The use of nectar-producing companion plants in crops is a well-known strategy of conserving natural enemies in biological control. However, the role of floral volatiles in attracting parasitoids and effects on host location via herbivore-induced plant volatiles is poorly known. Here, we examined the role of floral volatiles from marigold (Tagetes erecta), alone or in combination with volatiles from sweet pepper plant (Capsicum annuum), in recruiting Aphidius platensis, an important parasitoid of the green peach aphid Myzus persicae. We also investigated whether marigold floral volatiles are more attractive to the parasitoid than those emitted by sweet pepper plants infested by M. persicae. Olfactometry assays indicated that floral volatiles attracted A. platensis to the marigold plant and are more attractive than sweet pepper plant volatiles. However, volatiles emitted by aphid-infested sweet pepper were as attractive to the parasitoid as those of uninfested or aphid-infested blooming marigold. The composition of volatile blends released by uninfested and aphid-infested plants differed between both blooming marigold and sweet pepper, but the parasitoid did not discriminate aphid-infested from uninfested blooming marigold. Volatile released from blooming marigold and sweet pepper shared several compounds, but that of blooming marigold contained larger amounts of fatty-acid derivatives and a different composition of terpenes. We discuss the potential implications of the aphid parasitoid attraction in a diversified crop management strategy.

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Acknowledgements

We thank the Coordination for the Improvement of Higher Education Personnel (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, CAPES) for granting a doctoral scholarship to the first author, the Department of Entomology of the Federal University of Lavras (Universidade Federal de Lavras, UFLA) for facilitating the completion of the study, and Arodí Prado Favaris and Rafaela Cristina dos Santos of the Laboratory of Chemical Ecology and Insect Behavior at ESALQ for collecting and identifying the volatiles. The research leading to these results was partially funded by the National Institute of Science and Technology (INCT) Semiochemicals in Agriculture (Fundação de Amparo à Pesquisa do Estado de São Paulo FAPESP and Conselho Nacional de Desenvolvimento Científico e Tecnológico CNPq, grant numbers 2014/50871-0 and 465511/2014-7, respectively), CAPES (process 1416746) and by the FAPESP (process 2016/12771-0).

Funding

The authors thank the INCT Semiochemicals in Agriculture (FAPESP and CNPq, grant numbers 2014/50871–0 and 465511/2014–7, respectively). The research leading to these results was partially funded by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES (process 1416746) and FAPESP (process 2016/12771–0).

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The authors contributed to the study conception and design. Material preparation, data collection, analysis, and all writing were performed by Diego Bastos Silva and Ivana Lemos Souza. The first draft of the manuscript was written by Ivana Lemos Souza, Luís Cláudio Paterno, Maria Fernanda Gomes Villalba Peñaflor, and Rosangela Cristina Marucci. The work was carried out with resources from the laboratories of Maria Fernanda Gomes Villalba Peñaflor and José Maurício Simões Bento. All authors commented on previous versions of the manuscript. And all authors read, reviewed, and approved the final manuscript.

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Correspondence to Ivana Lemos Souza.

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Communicated by: John A. Byers

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Souza, I.L., Silva, D.B., Silveira, L.C.P. et al. A parasitoid’s dilemma between food and host resources: the role of volatiles from nectar-providing marigolds and host-infested plants attracting Aphidius platensis. Sci Nat 109, 9 (2022). https://doi.org/10.1007/s00114-021-01780-8

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  • DOI: https://doi.org/10.1007/s00114-021-01780-8

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