Peronospora valerianellae explained

Peronospora valerianellae is a plant pathogen. It causes downy mildew on leaves of lamb's lettuce Valerianella locusta, 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.^{[1] [2]}

Notes and References

1. Book: Smith IM, Dunez J, Lelliott RA, Phillips DH, Archer SA . European Handbook of Plant Diseases . Blackwell Scientific Publications . 1988 . 978-0-632-01222-0.
2. Book: Holliday P . A Dictionary of Plant Pathology (2nd edition) . Cambridge University Press . 2001 . 978-0-521-59458-5.