European canker

European canker

[¦yu̇r·ə¦pē·ən ′kaŋ·kər] (plant pathology) A fungus disease of apple, pear, and other fruit and shade trees caused by Nectria galligena and characterized by cankers with concentric rings of callus on the trunk and branches. A fungus disease of poplars caused by Dothichiza populea.