A destructive disease of apple and pear trees, caused by a bacterium (Erwinia amylovora) that blackens the leaves and kills the branches.

• 梨火疫：一种苹果树和梨树的毁坏性疾病，由一种细菌（解淀粉欧文氏杆菌）引起，它使叶子变黑，使树枝坏死