Although nematodes contribute to a healthy soil, there are numerous nematodes that pose a serious threat to crops. The most harmful nematodes live underground and damage particularly the roots of crops. The best known nematodes are cyst nematodes such as the potato cyst nematode which is responsible for potato senescence. Another more famous nematode is the root-knot nematode and the root lesion nematode. With the breeding of catch crops, Vandinter Semo focuses on a natural combatting of nematodes.