Free living nematodes (FLN) and root-knot nematodes (RKN) are increasing problems in root and tuber crops such as potato, sugar beet and carrot. There is a need for effective sanitation techniques and tolerant crops/varieties to keep population levels low in the rotation. Recently, the severe species Meloidogyne chitwoodi has been found in the south of Sweden. There is an urgent need for knowledge on how to limit spread of the nematodes and how to sanitate the fields. The aim of this project is to develop disease management strategies to keep population levels of FLN and RKN as low as possible in the crop rotation. The objectives are: 1) study the host crop status for main crops, 2) evaluate the effect of using resistant inter crops and black fallow, and 3) evaluate potato varieties for tolerance to FLN and RKN. The results are valuable in extension service to farmers and they will be able to choose tolerant/resistant crops in the rotation and thus minimize the yield loss.