Sweet chestnut (Castanea sativa Mill.) is a nutritious food with high social and economic impact in Portugal. Fungal infection and rots lead to great economic and quality losses in stored chestnut. The fungus Gnomoniopsis smithogilvyi (syn. Gnomoniopsis castaneae) is currently considered one of the major threats to the chestnut chain worldwide. Considering the lack of knowledge on both the disease and the causa...