Fungi are important crop pathogens, as they reproduce rapidly, affect a wide range of crops around the world, cause some 85% of plant diseases, and can create serious economic losses.[43][44] The range of types of fungi involved is also wide, including Ascomycetes such as Fusarium causing wilt, Basidiomycetes such as Ustilago causing smuts[45] and Puccinia causing cereal rusts,[46] and Oomycetes such as Phytophthora causing potato late blight and the resulting Great Irish Famine of 1845-1849.[47] Where crop diversity is low, and in particular where single varieties of major crops are nearly universal, fungal diseases can cause the loss of an entire crop, as with the potato in Ireland, and as with the monocultured crop of maize (corn) in the USA in 1970, where over a billion dollars' worth of production was lost.[48] Similarly, the 'Gros Michel' seedless banana crop was essentially completely destroyed worldwide in the 1950s by the wild fungus, Fusarium oxysporum.[49] It was replaced by the Cavendish banana, which in turn was in 2015 facing total destruction by the same disease.[50]