The observations carried out in city greenery and ornamental nurseries proved that there are six species of woolly aphids (Eriosomatidae) forming galls: on the leaf petiole – Pemphigus bursarius and Pemphigus spyrothecae; on the main nerve of leaf lamina – Pemphigus populi and P. populinigrae; on leaf lamina – Thecabius affinis and T. lysimachiae. Descriptions and photographs of galls formed by woolly aphids are given.