Peronospora antirrhini explained

Peronospora antirrhini is a plant pathogen. It causes downy mildew on leaves of species of Antirrhinum and related genera (e.g. Misopates).^[1]

The disease is generally of minor importance, but can be damaging on antirrhinum seedlings in the glasshouse, which may be systemically infected.^[2]

Further reading

Byrne. JM. Hausbeck. MK. Sconyers. LE. Influence of Environment on Atmospheric Concentrations of Peronospora antirrhini Sporangia in Field-Grown Snapdragon. Plant Disease. October 2005. 89. 10. 1060–1066. 10.1094/PD-89-1060. 30791273.

Notes and References

1. Book: Brandenburger W . Parasitische Pilze an Gefässpflanzen in Europa . Gustav Fischer Verlag . 1985 . 978-3-437-30433-0.
2. 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.