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Falagiarda M, Carnio V, Chiesa SG, Pignalosa A, Anfora G, Angeli G, Ioriatti C, Mazzoni V, Schmidt S, Zapponi L. Factors influencing short-term parasitoid establishment and efficacy for the biological control of Halyomorpha halys with the samurai wasp Trissolcus japonicus. PEST MANAGEMENT SCIENCE 2023; 79:2397-2414. [PMID: 36811274 DOI: 10.1002/ps.7423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 01/23/2023] [Accepted: 02/21/2023] [Indexed: 06/02/2023]
Abstract
BACKGROUND Classical biological control has been identified as the most promising approach to limit the impact of the invasive pest species Halyomorpha halys (Heteroptera: Pentatomidae). This study investigated the parasitism rate at sites where the biocontrol agent Trissolcus japonicus (Hymenoptera: Scelionidae) was released and where its unintentional introduction took place, in the Trentino-South Tyrol region. The effect of land-use composition was studied to understand which factors favor the establishment of hosts and parasitoids, including native and exotic species. RESULTS The released T. japonicus were detected a year after the start of the program, with a significant parasitoid impact and discovery, compared to control sites. Trissolcus japonicus was the most abundant H. halys parasitoid, and Trissolcus mitsukurii and Anastatus bifasciatus were recorded also. The efficacy of T. mitsukurii was lower in sites where T. japonicus was successfully established, suggesting a possible competitive interaction. Parasitism level by T. japonicus at the release sites was 12.5% in 2020 and 16.4% in 2021. The combined effect of predation and parasitization increased H. halys mortality up to 50% at the release sites. Landscape composition analysis showed that both H. halys and T. japonicus were more likely to be found at sites with lower altitude and with permanent crops, whereas other hosts and parasitoids preferred different conditions. CONCLUSION Trissolcus japonicus showed a promising impact on H. halys, at release and adventive sites, with minor nontarget effects, mediated by landscape heterogeneity. The prevalence of T. japonicus in landscapes with permanent crops could support IPM in the future. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Martina Falagiarda
- Institute for Plant Health, Entomology Group, Laimburg Research Centre, Auer, Bozen, Italy
| | - Veronica Carnio
- Institute for Plant Health, Entomology Group, Laimburg Research Centre, Auer, Bozen, Italy
- Faculty of Science and Technology, Free University of Bozen-Bolzano, Bozen, Italy
| | - Serena Giorgia Chiesa
- Technology Transfer Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
| | - Antonio Pignalosa
- Institute for Plant Health, Entomology Group, Laimburg Research Centre, Auer, Bozen, Italy
| | - Gianfranco Anfora
- Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
- Center for Agriculture, Food and Environment (C3A), University of Trento, S. Michele all'Adige, Trento, Italy
| | - Gino Angeli
- Technology Transfer Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
| | - Claudio Ioriatti
- Technology Transfer Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
| | - Valerio Mazzoni
- Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
| | - Silvia Schmidt
- Institute for Plant Health, Entomology Group, Laimburg Research Centre, Auer, Bozen, Italy
| | - Livia Zapponi
- Research and Innovation Centre, Fondazione Edmund Mach, S. Michele all'Adige, Trento, Italy
- Institute of BioEconomy, National Research Council of Italy, S. Michele all'Adige, Trento, Italy
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