As part of the fight against the spread of the colored canker, the suspicions of contamination must be confirmed by the authorities in charge of plant protection. In the event of contamination, the affected plane trees are felled during the winter. It is executed according to a regulatory protocol to set a perimeter around the trees. The program is implemented by close monitoring of the canal's biodiversity. Featured: Emilie COLLET, head of the Environment & Landscapes Office, Voies Navigables de France – South-West Territorial Department