tubercule en forme d'haltère

OBS: Il s'agit de pommes de terre difformes où il y a eu développement de tubercules secondaires.

CONT: Second growth may be of several types: 1) deformed tubers with protruding eyes, lateral buds (knobby tubers), or apical buds (dumbbells or elongated tubers).... Second growth is commonly attributed to high field temperatures and drought. It may, however, result from regeneration following any condition causing irregular rates of tuber development, such as uneven availability of nutrients or moisture, extremes in temperature, or vine defoliation from hail or frost.