Alternaria
/ˌɔːltəˈnɛːrɪə/ /ˌɒltəˈnɛːrɪə/noun
A genus of hyphomycetous fungi which cause various plant diseases; (also alternaria) a fungus of this genus. Frequently attributive: designating a disease caused by such a fungus.
Origin
Mid 19th century; earliest use found in Transactions of the American Philosophical Society. From scientific Latin Alternaria from classical Latin alternus + -āria; compare -a.