Forest ecosystems play an important role in South West Europe. They occupy more than 30% of the territory in France, Spain, and Portugal. These ecosystems are subject to increasing multiple biotic (e.g. insects and fungi) or abiotic (storms, fires) hazards. Although European forests are managed at a national level, forest damages often have effects beyond administrative borders. PLURIFOR is a three-year project which aimed to facilitate cross-border collaboration in South-west Europe and to improve regional or transnational risk management plans for forest areas susceptible to forest hazards. The project focused on five biotic (Eucalyptus weevil, Pinewood nematode, Chestnut gall wasp, Pine pitch canker, emerging pests, and diseases) and three abiotic (Storm, fire, soil degradation) hazards currently prevailing in southwestern forests. Research institutes, universities, forest-related organisations, councils and governments at local, regional and national levels exchanged their expertise through survey questionnaires and during technical workshops to build innovative risk tools and up to date risk management plans. Field inventory and laboratory analyses were conducted to test new methodologies for forest risk prevention. Remote sensing tools (lidar, UAV) were also used to characterize tree mortality. Altogether, Plurifor contributed to the development of 27 risk management tools and 13 risk management plans. A panel of forest risk management experts has been implemented to ensure an on-going collaboration of forest hazards at a European level
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