One of the mysteries of the English language finally explained.
A genus of fungal plant pathogens of the order Peronosporales, having sporangia borne on the tips of dichotomously branched sporangiophores and causing highly destructive plant diseases (downy mildews); (also in form peronospora) a fungus of this genus.
Mid 19th century; earliest use found in Jabez Hogg (1817–1899), ophthalmic surgeon. From scientific Latin Peronospora from ancient Greek περόνη + σπόρος.
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