Root lesion nematodes live in roots and are therefore classified as endoparasites. In contrast to the cyst nematode and the root-knot nematode, the root lesion nematode is mobile for all of its life and is not bound to a root. The root lesion nematodes penetrate deep into the root and use the cells as nutrients. This causes brown spots (lesions). When many larvae are active in the root system, they gobble up the entire root system. Because of the root lesion nematodes, ‘contaminated’ crops often become susceptible to fungi.