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Hello Andr?, it is a difficult case and I had to ask a leafbeetle expert first. Two results: The host plant doesn?t matter, it?s only Populus sp. (vitellinae you will find on Populus too). Ph. atrovirens is possible, but without male genitalia there will be no 100% id. But we can call your specimen "atrovirens cf." If it?s possible, you should collect some males and we can delete the "cf.". If you send me photos, please crop them to 600x400. Thanks in advance Frank