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,
Crop Trust Crop Trust The Crop Trust, officially known as the Global Crop Diversity Trust, is an international nonprofit organization which works to preserve crop diversity in order to protect global food security. It was established through a partnership between the United Nations Food and Agriculture Organization and CGIAR acting through Bioversity International. In 2006, the Crop Trust entered into an agreement with the governing body of the International Treaty on Plant Genetic Resources for Food and Agriculture. The agreement recognises the Crop Trust as an "essential element" of the treaty's funding strategy in regards to the "ex situ" conservation and availability