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But in the Irish famine of the late 1840s, successive blasts of potato blight - or to give it its proper name, the fungus Phytophthora infestans - robbed more than one-third of the population of their usual means of subsistence for four or five years in a row.
By the 1840s, Ireland was so dependent on the potato that the proximate cause of the Great Famine was a potato disease. Maize and manioc, introduced by the Portuguese from South America in the 16th century, have replaced sorghum and millet as Africa's most important food crops.offee (introduced in the Americas circa 1720) from South America and sugar cane (introduced from South Asia) from the Spanish West Indies became the main export commodity crops of extensive Latin American plantations.