What sort of creature "girdles" an apple fruitlet?

Completely “girdled”. What do you thing might have done this?




Or perhaps it was not due to some insect but some other cause…?

I might be European Apple Sawfly.

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Ashmead’s has a half dozen or so similar fruitlets. This was the only one I found that made a complete circle. I will have to keep an eye out for this guy,

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