I’m Currently in the middle of BBC’s fantastic documentary The Story of Ireland, narrated by Fergal Keane. Investigated in one of the episodes are the devastating consequences of the potato blight which caused the Irish Famine in the mid-19th century. Caused by the microorganism, Phytophthora infestans (Latin for ‘plant destroying infestation), the blight destroys the leaves of potato crops causing the potatoes to rot.