We maintain and propagate strains of pests responsible for various diseases and plagues for internal research. We have several physiotypes and pathotypes of each of the different diseases, each varying in aggressiveness and pathogenity. Examples are potato cyst nematodes (Globodera rostochiensis and G. pallida), potato wart disease, Phytophthora, Alternaria, Fusarium spp., Phoma and silver scurf.