Coral red spot

I recently noticed a fungus disease on a couple of my trees. The first is a hawthorn and the second is a hornbeam. The pictures are not brilliant as the lighting seems to have been a bit strong and has burnt out the colour. However, from my research on the web, it seems that they are afflicted by a fungal infection called “coral red spot”. The standard treatment seems to be to cut out the infected parts. This might be fine on a branch on a woodland tree but obviously creates problems in a bonsai, particularly if it is on the main part of the trunk.
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Does anyone have experience of treating this type of infection in a bonsai? Is there a fungicide designed to do the job. Any advice as to how to deal with the problem on these trees would be appreciated.

Hello Peter. Coral spot usually appears on deadwood before it starts on live wood. Most fungicides will treat it including Lime Sulphur.