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.
The paper focuses on two groups of parasitic Hymenoptera: (primary) parasitoids and hyperparasitoids of aphids. The author summarizes also the studies on parasitoids of different aphid species, including pests, in different seminatural habitats and agrocoenoses. At the end of the article the author gives new ideas, as well as proposals and perspectives of future investigations.