Dealing with invasions of exotic pests in the forest: new challenges and new methods.
Two main factors favor the introduction and establishment of new species of forest pests and pathogens on French soil. On the one hand, the circulation of goods and people between all countries of the world is intensifying. On the other hand, climate change favors the establishment of species hitherto unable to survive in our country. Recent examples are provided by the rapid progression of ash chalarosis since 2008, the outbreaks of chestnut cynips and boxwood moth, and by the discovery of Xylella fastidiosa in Corsica in 2015. The pine tree nematode, present in the Iberian Peninsula, poses a threat to French pine groves, primarily in Aquitaine. This context leads to further reflection on the means to anticipate the arrival of these species on our territory, to quickly detect their presence, to assess the risks that they impose on forests (and more generally on all trees) and to develop appropriate prevention and control measures. The purpose of the session will be to present the progress of recent methodologies that allow progress in these directions.