Irish Potato Famine

Also called  Great Potato Famine, Great Irish Famine, or Famine Of   1845–49, famine that occurred in Ireland in 1845–49 when the potato crop failed in successive years. The crop failures were caused by late blight (q.v.), a disease that destroys both the leaves and the edible roots, or tubers, of the potato plant. The causative agent of late blight is the fungus Phytophthora infestans. The Irish Potato Famine was the worst famine to occur in Europe in the