Posted: 06/08/2015 at 20:50
If you do scrub the bark then use a Horticultural soft soap, which is reasonably organic. The wool on these pests is a wax covering which makes them water proof. The soap removes it and then they drown. They do need removing as they can seriously damage the trees.
The marks on the fruit sound more like Apple scab than Bitter pit. Bitter pit does not normally show on the skin as early as this.
Bit late to do anything now, but in future you cold try spraying with Copper sulphate, again reasonably organic.
Despite the marks on the skins the apples are usually still edible when peeled.