Disclosed is a method for the fungicidal and/or anti-germinating treatment of bulbs or tubers, comprising the application by thermal fogging of mint oil, L-carvone or mixtures thereof, optionally diluted in an organic solvent, at an initial dose of L-carvone of between 60 g and 400 g per tonne of bulbs or tubers, then one or more applications repeated at a frequency of between three days and six weeks.