''Peronospora valerianellae'' is a plant pathogen. It causes downy mildew on leaves of lamb's lettuce ''

Valerianella locusta ''Valerianella locusta'', called mâche or mache; common cornsalad; or lamb's lettuce, is a small, herbaceous, annual flowering plant in the honeysuckle family Caprifoliaceae. It is native to Europe, western Asia and north Africa, where it is ...

'', which is widely grown as a salad plant in several European countries (for example France and Germany). It is transmitted by seed-borne oospores, and is controlled by fungicide sprays of the foliage.

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{{Taxonbar, from=Q7169465 Water mould plant pathogens and diseases Leaf vegetable diseases Peronosporales Species described in 1888 Taxa named by Karl Wilhelm Gottlieb Leopold Fuckel