Crop diversity are all susceptible to a single fungus, "Fusarium oxysporum" (Panama disease); large areas of the crop were destroyed by the fungus in the 1950s. 'Gros Michel' has been replaced by the current main banana on the market, the 'Cavendish', which in turn is (2015) at risk of total loss to a strain of the same fungus, 'Tropical Race 4'. Such threats can be countered by strategies such as planting multi-line cultivars and cultivar mixes, in the hope that some of the cultivars will be resistant to any individual outbreak of disease. The implications of crop diversity are at both local
Crop-lien system Crop-lien system The crop-lien system was a credit system that became widely used by cotton farmers in the United States in the South from the 1860s to the 1930s. Sharecroppers and tenant farmers, who did not own the land they worked, obtained supplies and food on credit from local merchants. The merchants held a lien on the cotton crop and the merchants and landowners were the first ones paid from its sale. What was left over went to the farmer. The system ended in the 1940s as prosperity returned and many poor farmers moved permanently to cities and towns, where