Twenty‐five varieties of potato in common commercial cultivation were found to be susceptible to tuber attack by potato‐derived populations ofDitylenchus destructorunder field and pot experimental conditions. Stunting and leaf deformation may also be caused by the eelworms but appear less consistently. A race ofD. destructorfrom mushroom spawn had almost no effect on potatoes. Various races ofD. dipsacican reproduce in the shoot tissue of potato, sometimes causing damage. One population of this stem eelworm produced lesions on the tub