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Habitat preference of Drosophila suzukii across heterogeneous landscapes

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Abstract

In temperate regions, generalist insect pests are expected to use multiple habitats and host plant species over the different seasons. Landscape composition and configuration can also provide a diversity of thermal resources and host plants that can modify insect activity and movement. Here, we described the seasonal spatial distribution of a destructive invasive pest, spotted wing drosophila (SWD), along a gradient of landscape composition (i.e. proportion of forest habitat) and configuration (i.e. length of forest edge). We selected a triplet of habitat patches (forest, vineyard and grassland) in 17 landscapes in North-eastern Italy characterised by different proportions of forest and forest edge length and monitored pest activity density for 1 year. We found that during the cold season, SWD mostly occupied forest habitats, which were suitable overwintering sites due to ideal microclimatic conditions. During plant-growing season, SWD occurred equally in the three habitats, probably due to warmer temperatures in open areas as well as high food and host availability. In summer, when high temperatures can be limiting, landscapes with large forest edge length presented an increase in activity density compared to landscapes with less amount of edges, irrespective of the total cover of forest. Large edge length indicated landscapes with high contact zones between forest and open habitats, probably favouring spillover of individuals in SWD. In the light of these results, pest control in crop fields located in landscapes with complex configurations can be particularly challenging. The high density in non-crop habitats suggests that this invasive species can have pervasive impact also on wild plant species occurring in semi-natural and natural habitats.

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Acknowledgements

We are grateful to the farmers who allowed us to carry out the experiments on their land. We thank Bioibérica S.A. Company and Michele Brardinelli for providing Suzukii Trap® attractant. We thank three anonymous reviewers for providing insightful comments that improved the manuscript.

Funding

This work was supported by the European Union’s Seventh Framework Programme for Research, Technological Development and Demonstration, DROPSA [Grant Number 613678]. GS received a grant from Aldo Gini Foundation (Padova).

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Correspondence to Giacomo Santoiemma.

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The authors declare that they have no conflict of interest.

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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 A. Biondi.

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Santoiemma, G., Trivellato, F., Caloi, V. et al. Habitat preference of Drosophila suzukii across heterogeneous landscapes. J Pest Sci 92, 485–494 (2019). https://doi.org/10.1007/s10340-018-1052-3

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  • DOI: https://doi.org/10.1007/s10340-018-1052-3

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