The RHS believes that avoiding pests, diseases and weeds by good practice in cultivation methods, cultivar selection, garden hygiene and encouraging or introducing natural enemies, should be the first line of control. If chemical controls are used, they should be used only in a minimal and highly targeted manner.
- There is anecdotal evidence that the disease varies in severity from year to year, so raking up and destroying infected leaves may be helpful in reducing the amount of infection in the following year
- Choose resistant species. The most susceptible species are Cornus florida and C. nuttallii and, to a possibly lesser extent, C. kousa. In studies in the USA, C. controversa and C. sericea were also susceptible. Native European Cornus species in the UK appear unaffected. There is currently insufficient information available for other species
There are no fungicides available to amateur gardeners with specific recommendations for use against cornus anthracnose. However, the fungicides tebuconazole (Provanto Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Provanto Fungus Fighter Plus, Toprose Fungus Control & Protect), and triticonazole (Fungus Clear Ultra) are labelled for the control of other diseases on ornamental plants, and could therefore be used legally on Cornus (at the owner’s risk) to try and control anthracnose.
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 sprayer
Chemicals: using safely and effectively
Chemicals: storing and disposing safely