Definition of Peronospora in English:


Pronunciation /ˌpɛrə(ʊ)ˈnɒsp(ə)rə/


(also Peronosporos)
  • 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.

    Plasmopara viticola, the cause of downy mildew of grapes, and Phytophthora infestans, the cause of late blight of potatoes, were formerly placed in this genus.


Mid 19th century; earliest use found in Jabez Hogg (1817–1899), ophthalmic surgeon. From scientific Latin Peronospora from ancient Greek περόνη + σπόρος.