Cornus anthracnose is a fungal disease that kills the leaves and young shoots of some North American Cornus species (dogwoods). Infections cause dead blotches on leaves and die-back of young stems.
What is cornus anthracnose?
Cornus anthracnose is a fungal disease caused by Discula destructiva, which arrived in the UK from North America in the late 1990s.
It infects and kills the leaves and young shoots of some North American Cornus species (dogwoods). Cornus florida is particularly susceptible, Cornus nuttallii and Cornus kousa may also be attacked. Native UK Cornus species appear unaffected.
Damage occurs from late spring until leaf fall in the autumn.
You may see the following symptoms:
- On leaves: Spots and blotches of dead tissue appear. Under wet conditions, the blotches expand and the leaf shrivels and falls. A severe attack can completely defoliate a tree
- On stems: Young stems die back and under wet conditions tiny raised pimples (fruiting bodies of the fungus) can be seen on the bark
- Bark cankers have been reported on susceptible Cornus species in the USA
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