The various species of potato seeds must be free from the following parasites and diseases: Popillia Japonica, Leptinotarsa Decemlinesta, Phthoremses Operculella, Euzaphera Osseatella,Synchytrium Endobioticum, Golbodera Rostochiensis, Globodera Pallids, Trichodorrus Spp. and Paratrichodorus Spp., Clavibacter Michiganensis, Pseudomonas Solnacearum, Corky Ring Spot (Tobacco Rattle Virus), Ditylenchus Destructor, Meloidogyne Spp., Erwinis Carotovora, Erwinis Carotovora Stroseptica, Leaf Roll Virus, Spindle Tuber Viroid, Mop Top Virus, Frost Injury, Phytophthora Erythroseptica, Phytophthora Infestants, Atternaria Solani 0,1%, Fusarium Spp. Verticillium Spp. 0,1%, Phoma Spp. 0,1%, Internal brown stem and browning, black spot and vascular discolouration 0,1%, Hollow heart 0,1%, Mechanical damage 0,1%, Skin necrosis 0,1%, Streptomyces Scabies, Spongospora Subterranes, Rhizoctonia solani, Helminthosporium solani. The size of the seed must be 28-60 mm.