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apples

has anyone any idea what these are that were on some of my apples, they pick off quite easily and do not leave a mark.
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I think the silk threads you can see in the close-up is a clue that they are the pupae of an insect of some kind, perhaps a small fly or wasp. However, I haven't a clue what the insect is. Is there any sign of damage on the leaves of the tree?
Mussel Scale.
https://www.rhs.org.uk/advice/profile?PID=796
Yes, mussel scale.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.