Crop diversity fruit trees and banana plants) are cloned. A single pest or disease could threaten a whole crop due to this uniformity ("genetic erosion"). A well-known historic case was the Irish Potato Famine of 1845-1847, where a vital crop with low diversity was destroyed by a single fungus. Another example is when a disease caused by a fungus affected the monocultured 1970 US corn crop, causing a loss of over one billion dollars in production. A danger to agriculture is wheat rust, a pathogenic fungus causing reddish patches, coloured by its spores. A virulent form of the wheat disease, stem rust,
History of Panama (to 1821) History of Panama (to 1821) In the history of Panama, the earliest known inhabitants were the Cueva and Coclé tribes, but they were drastically reduced by disease and fighting when the Spanish arrived in the 16th century. But some moved out of Panama to have children and increase population. Rodrigo de Bastidas, sailing westward from Venezuela in 1501 in search of gold, was the first European to explore the Isthmus of Panama. 10 years later, Vasco Núñez de Balboa visited the Isthmus and established a short-lived settlement in the Darién. Vasco Núñez de Balboa's torturous trek from the Atlantic to