Root diseases regroup various pathogens who can cause very different kinds of symptoms on the plant: root rots (rhizoctonia and violet root rots), rhizomania (virus) and beet cyst nematodes (BCN). Genetic resistance can provide effective control of these diseases, but may be challenged under high pressure situations. Maintaining a high level of genetic resistance over time is of first importance. ITB has been monitoring the durability of tolerant varieties to rhizomania and BCN in a network of farmers’ plots over many years in order to quickly react to any visible change of disease pressure and impact.