If the problem is not too severe you could pare out the diseased area with a knife and then paint it with a fungicidal wound paint
, such as Bayer Arbex Seal & Heal.
Prune apple and pear trees, and treat the cuts with a wound paint
Treat large wounds - more than 2.5cm (1in) in diameter - with a wound paint
to help prevent silver-leaf fungus getting in.
Treat the cut surface with wound paint
to help prevent disease spores entering.
Seal the scar with wound paint
and don't forget to clean your saw after using it for pruning.
Research has shown that wound paints
do not assist in the healing process and may in some cases hinder it.