Plasmopara chaerophylli
A downy mildew parasitising Cow Parsley and Rough Chervil (Anthriscus sylvestris and Chaerophyllum temulentum). White down on the leaf undersides with corresponding pale green patches above, turning bronze. This is considered to be a gall-causer.
host 
Photograph both sides of the leaf and the downy mildew on the host plant; ensure you have noted the host species in your comments
Cow Parsley and Rough Chervil - woodlands, hedgerows, shady places
This is part of the Plasmopara crustosa s.lat. species complex of downy mildews that affect host plants in the Apiaceae (umbellifer) family. The compex has recently been split into several species depending on host. See https://www.aber.ac.uk/waxcap/downloads/Chater20-DownyMildewsWales.pdf
Graham Calow
Sapcote
04 April 2014
underside of leaf
Cow Parsley
Graham Calow
Sapcote
04 April 2014
on Cow Parsley
Graham Calow
Sapcote
04 April 2014
on Cow Parsley
Graham Calow
Sapcote
04 April 2014
underside of leaf
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Species profile
- Species group:
- fungoid
- Kingdom:
- Chromista
- Order:
- Peronosporales
- Family:
- Peronosporaceae
- Records on NatureSpot:
- 3
- First record:
- 04/04/2014 (Calow, Graham)
- Last record:
- 30/05/2019 (lemmon, roy)
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