o:7090 Collaborative approaches to urban tree biosecurity: Stakeholder’s perceptions, actions and social networks en In past decades, urban tree biosecurity has taken on growing importance worldwide. Stakeholders play a key role in countering the spread of invasive alien pests and pathogens that affect the health of urban green infrastructures. The aim of this study was to increase the understanding of the role of stakeholders’ perceptions, priorities and networks in the implementation of actions to guarantee a coherent biosecure system. The research was done in three steps. First, stakeholder mapping was carried out to identify relevant actors. Second, a questionnaire on perceptions, actions and collaboration among stakeholders involved in urban biosecurity was developed and administered. Third, data was processed to compare the responses given by the different categories of stakeholders. Stakeholder mapping identified 953 relevant stakeholders of which 255 stakeholders from 19 countries completed the online survey. According to the stakeholders, the current most important urban tree pests across Europe are Cameraria ohridella and Cydalima perspectalis, mentioned in 13 and 12 countries respectively, while other pests and pathogens have been specifically mentioned in individual countries (Thaumetopoea pityocampa in Spain, Ips typographus in Latvia and Serbia, Ceratocystis platani in Italy and Türkiye). Regarding future threats to urban trees, the stakeholders emphasised significant concerns around the bacterial plant pathogen Xylella fastidiosa and insect pest Agrilus planipennis, mentioned in 12 and 14 countries respectively. In addition, the outcome of the study highlighted that the most widely adopted biosecurity actions by stakeholders are those related to communication, both to the general public (information) and to the staff involved in the biosecurity sector (training). A network analysis of relationships between stakeholder groups evidenced positive collaborations that tended to be more common the closer to hands-on practice of tree care the stakeholders were. The study provided a snapshot of the European stakeholders’ perceptions and readiness to implement biosecurity actions, highlighting the importance of connectedness as the basis to guarantee a coherent biosecure system. 1552099 https://doi.org/10.1016/j.ufug.2025.128674 2025-02-20T11:44:44.966Z 44 yes 46 Alessandro Paletto 46 Carlotta Sergiacomi 46 Mariella Marzano 46 Mersudin Avdibegović 46 Marta Bełka 46 Kathrin Blumenstein 46 Helena Bragança 46 Manuela Branco 46 Daiva Burokienė 46 Julio Javier Díez 46 Ilija Djordjević 0000-0001-9499-3565 46 Zuzana Dobšinská 46 Brynja Hrafnkelsdóttir 46 Magdalena Kacprzyk 46 Yasin Korkmaz 46 Martina Kičić 46 Liina Jürisoo 46 Kahraman İpekdal 46 Zuzana Jánošíková 46 Zane Lībieté 46 Diana Marčiulynienė 46 Dinka Matošević 46 Jitka Meňházová 46 Saša Orlović 46 Carmen Morales‐Rodrìguez 46 Irena Papazova–Anakieva 46 Špela Pezdevšek Malovrh 46 Leopold Poljaković-Pajnik  46 Ana Paula Ramos 46 Tarik Treštić 46 Katalin Tuba 46 Anna Maria Vettraino 46 Milica Zlatković 46 Johanna Witzell application/pdf 3553210 https://unilib.phaidrabg.rs/o:7090 no yes 18 70 1552253 2025 Urban Forestry & Urban Greening 105 Elsevier 2025