Coral spot is
a fungal disease of woody plants causing branches to die back. Small coral-pink
raised spots (pustules) form after the branch dies. Coral spot often
indicates that the plant has been weakened by other factors.
Coral spot, so-called because after affected branches die they develop
pinhead-sized pink fungal pustules, is a disease caused by the fungus Nectriacinnabarina.
It causes die-back of branches of woody plants, but the causal fungus is a weak
pathogen and its presence often indicates that the plant also has other
Among broadleaf trees and shrubs, Acer, Aesculus (horse
chestnut), Carpinus (hornbeam), Fagus (beech),Juglans (walnut) and Tilia (lime)
are among the more susceptible to attack. It is rarely found on conifers.
The small coral-pink
fungal pustules may be seen at all times of year.
You may see the following symptoms:
Die-back of branches, usually those that have been broken or pruned
After death, pinhead-sized pink pustules of the causal fungus appear on
Always prune in dry weather. When carrying out routine pruning, cut
branches through the collar (ring of slight swelling found at the base of
branches). Healing of wounds occurs most quickly here, compared to leaving
stubs (snags) or cutting flush with the bough or trunk. If die-back occurs
after pruning, remove dead material to avoid further infection.
Prune out infections promptly and cut back to healthy wood. Do not leave
dead wood to moulder and generate spores in damp corners of the garden.
There are no specific fungicidal controls for this disease.
If it is necessary to prune in wet weather when risks of infection are
high, or if the plant has previously shown a particular susceptibility to the
problem, use a wound paint (VitaxMedo, Bayer Garden Arbrex Seal and Heal,
Growing Success Prune and Seal) to protect the cut.
However, wound paints are
not recommended for routine use as they are thought to interfere with healing
and may even provide a better environment for rots