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Reproductive performance of the European grapevine moth Lobesia botrana (Tortricidae) is adversely affected by warming scenario

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Abstract

The European grapevine moth, Lobesia botrana (Denis and Schiffermüller), is an important grape pest worldwide. To forecast how this species might respond to climate change has emerged as one major challenge in recent viticultural research. Predictions about L. botrana population dynamics under global warming scenario are usually derived from physiologically based demographic models (PBDMs). Despite their ecological realism, PBDMs are based on physiological equations derived from constant, unrealistic thermal regimes, and they exclude the effects of temperature on male’s reproductive traits, which importantly mediates population dynamics in this species. Focused on Burgundy (a viticultural region of France), we compared the adult performance of L. botrana between the Current Fluctuating Regime (CFR) based on in situ meteorological data and the Future Fluctuating Regime (FFR) based on the outputs of climate models. Under controlled conditions complying to the scenario of local warming termed FFR, L. botrana individuals incurred reduced adult lifespan, while their body amounts of four major energetic components (proteins, lipids, glycogen, soluble carbohydrates) remained unchanged compared to individuals exposed to the CFR. Furthermore, each sex endured reproductive costs associated with local warming scenario: females incurred reduced mating success, and males bore decreased fertility (lower number of eupyrene sperms within spermatophore). Our results indicate that global warming should adversely impact the reproductive success of L. botrana and the local abundance of this pest. In terms of pest management, our findings might contribute to the increase in the ecological realism of PBDMs and improve the reliability of their predictions about the population dynamics of L. botrana.

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Acknowledgements

We are grateful to Lionel Delbac who managed the insect stock, Benjamin Bois and Sébastien Zito who designed the thermal regimes, and Samuel Ribeiro for his practical support all along the experiments. We also want to thank the two anonymous reviewers for their insightful comments and relevant suggestions on the manuscript.

Funding

This study was funded by the Conseil Régional de Bourgogne Franche-Comté through the Plan d’Actions Régional pour l’Innovation (PARI) and two other funding sources (FABER LOUAPRE-AGREE-BGS and VALEACLIM-BOIS 20184-07116), and the European Union through the PO FEDER-FSE Bourgogne 2014/2020 programs.

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Correspondence to Corentin Iltis.

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The authors declare they have no conflict of interest.

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

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Communicated by N. Desneux.

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Iltis, C., Moreau, J., Pecharová, K. et al. Reproductive performance of the European grapevine moth Lobesia botrana (Tortricidae) is adversely affected by warming scenario. J Pest Sci 93, 679–689 (2020). https://doi.org/10.1007/s10340-020-01201-1

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  • DOI: https://doi.org/10.1007/s10340-020-01201-1

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