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Dear all,
we found two larvae (or prepupa?) within a bark gaps of an oak tree which is already invested by Agrilus bigutattus and had some sap flow.
Found end of Oct in Hessian/Germany.
As far as I could determine it, I would guess it should be syrphid larvaes perhaps members of Merodontini?
Could anyone confirme or correct it?

kind regards
Mike