Posted: 09/01/2013 at 17:57
Spray anywhere where the fungus spores might lodage, ie all the bark. It is not guaranteed to stop it, but it does reduce it. Or, at least it has on ours.
And Bluebell16's tree also has a bit of Scab on the leaves. Woryth spraying with Bordeaux mixture for that too.
By the way that is being withdrawn pretty soon too.