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After spring, after crops: which alternative hosts for the generalist parasitoid Diaeretiella rapae (Hymenoptera: Braconidae)?

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Abstract

Generalist aphid parasitoids seem to behave as specialists at the local scale. The temporal pattern of host exploitation by parasitoids is key to understand this result. We investigated the temporal dynamics during twenty-one consecutive months of host exploitation by Diaeretiella rapae (M’Intosh) (Hymenoptera: Braconidae), one of the most generalist aphid parasitoid, in cultivated and uncultivated areas. We applied two complementary approaches: molecular detection of parasitism within living aphids and rearing of aphid mummies collected in Brassicaceae crops and adjacent areas. We built a Maximum Likelihood tree to determine the influence of host plant and aphid species on the genetic structure of D. rapae. We confirmed the existence of a cryptic species developing on Hayhurstia atriplicis (L.) (Hemiptera: Aphididae), but we found no other host-related genetic variation. D. rapae exploited almost exclusively Brevicoryne brassicae (L.) (Hemiptera: Aphididae), a pest of Brassiceae and rarely other hosts. When the crop is absent, D. rapae parasitized B. brassicae on wild Brassicaceae and cover crop instead of alternative aphid host on other plants. These results show the limited role of uncultivated habitats as a reservoir for D. rapae and the interest of wild Brassiceae and cover crops to enhance the control of B. brassicae.

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Data availability

DNA sequences were assigned GenBank accessions: ON566082-ON566123 for COI; ON566160-ON566201 for 16S; ON586648-ON586689 for LWRh. Data used for the analysis are in the Supplementary Material 1.

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Acknowledgements

The authors thank Bernard Chaubet for technical assistance for identified aphids and parasitoids.

Funding

This work was supported by the French ‘Ministère de l’Enseignement Supérieur et de la Recherche’ and was founded by the French Research National Agency (PEERLESS project, ANR-12-AGRO-0006).

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YN and ALR designed the study. SD and YN designed the molecular approach. Material preparation, data collection, and analysis were performed by SD, YN, PC, CB, and ALR. The manuscript was written by SD, YN, and ALR. All authors read and approved the final manuscript.

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Correspondence to Anne Le Ralec.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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Supplementary Information

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Sampling data and molecular detection data (XLSX 51 KB)

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Derocles, S.A.P., Navasse, Y., Gardin, P. et al. After spring, after crops: which alternative hosts for the generalist parasitoid Diaeretiella rapae (Hymenoptera: Braconidae)?. Appl Entomol Zool 58, 205–217 (2023). https://doi.org/10.1007/s13355-023-00822-z

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  • DOI: https://doi.org/10.1007/s13355-023-00822-z

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