Help us achieve our goals:
make a donation »
Join the RHS today and
support our charity
Free personalised gardening advice
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Make a donation
Join the RHS today and support our charity
I have forgotten my password
Keep me signed in
Register for free to receive our newsletters, add comments to blogs/articles and to save content.
Pansies and violas may be attacked by various leaf spot diseases that disfigure the plants. Plants in containers and those in the ground can be equally affected.
Common name Pansy leaf spotsScientific name VariousPlants affected PansiesMain causes Fungus and fungus-like (Oomycete) organismsTiming Winter until early summer
Spots and blotches on the leaves of pansies are caused by the fungal pathogens Ramularia lactea, R. agrestis and Mycocentrospora acerina.
Pansies also suffer from downy mildew caused by the fungus-like (Oomycete) organism Peronospora violae.
Symptoms vary, depending on the disease that is to blame;
There are no fungicides available to gardeners with specific recommendations for the control of pansy leaf spots. However, the fungicides tebuconazole (Bayer Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Bayer Fungus Fighter Plus), and triticonazole (Scotts Fungus Clear Ultra and Scotts Fungus Clear Ultra Gun) may be used on pansies and will probably give useful control of leaf spot diseases. They will not control downy mildew.
Inclusion of a fungicide product does not indicate a recommendation or endorsement by the RHS. It is a list of products currently available to the home gardener.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)
Chemicals: using a sprayerChemicals: using safely and effectivelyChemicals: storing and disposing safely
All of these pathogens produce spores on the leaves that are spread by rain over short distances (leaf spots) or by wind over long distances (downy mildew). Mycocentrospora acerina and Peronospora violae also produce tough resting structures in the dead tissues which can contaminate the soil for several years, and the Ramularia spp. probably also do this.
The Ramularia spp. and Peronospora violae only infect pansies and violets, but Mycocentrospora acerina affects a wide range of plants and also causes storage rot in carrots.
Disposing of diseased materialEscallonia leaf spotsImpatiens downy mildewPansy downy mildewPlants to grow with kids: pansyPrimula leaf spots
the RHS today and get 12 months for the price of 9
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
Register for the site or sign in to share your experiences on this topic and seek advice from our community of gardeners.
We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.
Join the RHS today and get 12 months for the price of 9