A disease of chestnut trees caused by a fungus(Cryphonectria parasitica) that is especially destructive to the American chestnut, characterized by cankers that eventually kill the branches and trunk. 栗树疫病：一种栗树病害，由对美国栗树格外具有破坏性的一种真菌（栗疫菌） 引起，以最终会导致树枝和树干枯死的溃疡为特征