The invention relates to the use of active ingredients such as a succinate dehydrogenase inhibitor such as Pyraziflumid for controlling Sclerotinia spp., to a method for treating plants or plant parts for controlling Sclerotinia spp. and to a method for treating seed for controlling Sclerotinia spp. in the seed and in the plants which grow from the seed, by treating the seed with Pyraziflumid.