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Water limitation and host specificity modulate aphid parasitoid specialization through bottom-up effects

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Abstract

Freshwater resources available for agricultural production are in decline due to global change. Bottom-up forces due to abiotic stress such as water limitation may modulate parasitoid host range by modifying both adult preference and offspring performance defining parasitoid efficiency and safety in biocontrol programmes. In such context, we evaluated the impact of water limitation on 7 plant traits, 3 aphid performance traits, and parasitoid preference and performance of Aphidius ervi when encountering 6 plant–aphid complexes. The majority of the plants tested were smaller, had reduced stomatal conductance, and reduced leaf transpiration and photosynthesis rates under water limitation. The generalist aphids Macrosiphum euphorbiae, Myzus persicae, and Sitobion avenae were negatively affected by water limitation and showed increased generation time and reduced growth rate. By contrast, the specialist aphids Acyrthosiphon pisum, Aphis nerii, and Rhopalosiphum padi were not, or only slightly, impacted by bottom-up effects. Parasitoid choosiness was not drastically affected by bottom-up effects while aphid host suitability for parasitoid offspring development was decreased in the three generalist aphid species tested but not in the specialist ones. Aphid specificity (generalist vs. specialist) was a key factor explaining the bottom-up effect of water limitation on aphid performance and parasitoid efficacy as a biological control agent. Prediction of the impact of global change on the effectiveness of parasitoids could be useful to select the organisms best adapted to environmental conditions.

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Acknowledgements

We thank Christiane Métay-Merrien, Edwige Amiens-Desneux and Chrystal Desneux for technical support, Eric Wajnberg for comments on an earlier version of the manuscript, the project FP7 APHIWEB (611810) for funding to LSM and ND and the French Ministry of Foreign Affairs for funding to LTHN (PhD fellowship).

Funding

Funding was provided by FP7 International Cooperation (Grant No. 611810).

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Correspondence to Nicolas Desneux.

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The authors declare no conflict of interests. ND serves as Editor-in-Chief of Journal of Pest Science and was not involved in the review process and decisions related to this manuscript.

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This research did not involve any human participants and/or animals.

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Communicated by Cesar Rodriguez-Saona.

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Nguyen, LTH., Monticelli, L.S., Lavoir, AV. et al. Water limitation and host specificity modulate aphid parasitoid specialization through bottom-up effects. J Pest Sci 96, 1003–1017 (2023). https://doi.org/10.1007/s10340-022-01581-6

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  • DOI: https://doi.org/10.1007/s10340-022-01581-6

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