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Hi Frank,
oops, that's the part I always forget, because I'm not really interested in plants and trees. Still I realize it's important to know the host plant. I've got this shot of a leaf. Maybe you can derive from that which plant it was... I understand that Phratora vitellinae has Salix as hostplant. But Salix has long, slim leaves? If it turns out to be atrovirens, you can have the images if you want. I didn't find one in your gallery?