Hi Jukka!

> In fact, A. aeratella also makes a portable case! Mature larva
> cuts off the gall from the plant, but only, if the host plant is
> fresh. In breeding conditions (inside) Polygonum withers, and
> the larva doesn't manage to remove the gall. I have discovered
> this in ex ovo- breedings in natural conditions.....

This sounds really interesting, I've never read or heard about such a behaviour before! But did you observe how the larvae proceed feeding once they have cut off the gall as their case? Do they bore holes in the stems or blossoms to feed on inner tissues?

Kind regards,
Franziska