In Québec, the genus Pemphigus (family Aphididae) counts 5 species of insects. The stars? Poplar Spiral Gall Aphid, Poplar Petiole Gall Aphid and Poplar Leaf-base Gall, the most often observed. The richest region: Capitale-Nationale, with 4 species. Every species has its own page: photos, its season, its habitat and the best places to see it near you.