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Hi Heidrun,
I wrote yesterday in another topic that the photos of cases conserning C. therinella are incorrect and belong to C. peribenanderi, as also you have noticed.
I have bred several times both C. therinella and C. peribenanderi, and there is no doubt about this: C. therinella lives on Fallopia and Polygonum, C. peribenanderi on Cirsium and occasionally also on Centaurea.
Best wishes,
Jukka