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Predation on Drosophila suzukii within Hedges in the Agricultural Landscape

Siffert, Alexandra; Cahenzli, Fabian; Kehrli, Patrik; Daniel, Claudia; Dekumbis, Virginie; Egger, Barbara; Furtwengler, Jana; Minguely, Camille; Nicola, Stäheli; Franco, Widmer; Mazzi, Dominique and Collatz, Jana (2021) Predation on Drosophila suzukii within Hedges in the Agricultural Landscape. insects, 12 (305), pp. 1-12.

[thumbnail of Siffert_2021_Predation_Hedges.pdf] PDF - Published Version - English
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Document available online at: https://www.mdpi.com/2075-4450/12/4/305


The invasive Drosophila suzukii feeds and reproduces on various cultivated and wild fruits and moves between agricultural and semi-natural habitats. Hedges in agricultural landscapes play a vital role in the population development of D. suzukii, but also harbor a diverse community of natural enemies. We investigated predation by repeatedly exposing cohorts of D. suzukii pupae between June and October in dry and humid hedges at five different locations in Switzerland. We sampled predator communities and analyzed their gut content for the presence of D. suzukii DNA based on the COI marker. On average, 44% of the exposed pupae were predated. Predation was higher in dry than humid hedges, but did not differ significantly between pupae exposed on the ground or on branches and among sampling periods. Earwigs, spiders, and ants were the dominant predators. Predator communities did not vary significantly between hedge types or sampling periods. DNA of D. suzukii was detected in 3.4% of the earwigs, 1.8% of the spiders, and in one predatory bug (1.6%). While the molecular gut content analysis detected only a small proportion of predators that had fed on D. suzukii, overall predation seemed sufficient to reduce D. suzukii populations, in particular in hedges that provide few host fruit resources.

EPrint Type:Journal paper
Keywords:biological control, predators, molecular gut content analysis, earwigs, spiders, predatory, Abacus, FiBL25032 bugs; semi-natural habitat
Agrovoc keywords:
biological control
spiders -> Araneae
Subjects: Environmental aspects > Biodiversity and ecosystem services
Crop husbandry > Production systems > Fruit and berries
Crop husbandry > Crop health, quality, protection
"Organics" in general > Countries and regions > Switzerland
Research affiliation: Switzerland > Agroscope > ART - Reckenholz location
Switzerland > Agroscope > ACW - Research Centre Wädenswil
Switzerland > Agroscope > ACW - Research Centre Changins
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Sustainability > Biodiversity > Functional agrobiodiversity
Deposited By: Cahenzli, Dr. Fabian
ID Code:42480
Deposited On:10 Dec 2021 12:54
Last Modified:10 Dec 2021 13:33
Document Language:English
Refereed:Peer-reviewed and accepted

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