Infected wood has a brown or purple stain within its flesh.
Cut away all infected branches (the brown / purple stain in the branch flesh will indicate where the wood is infected) and burn them immediately. Cut away six inches past infected wood. Do this during the summer to minimise the risk of re-infection.
Sterilise the pruning shears after use and seal and large cuts on the branches with pruning sealant (available from most garden centres). Feed and water the tree to give it strength.
If the main trunk of the tree is clearly infected with fungus (mushroom like growth), all hope is gone and it is best to destroy and burn the whole tree.
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