In the middle taiga subzone of the Komi Republic, the accumulation of phytomass and the relative growth rate of invasive species – H. mantegazzianum were studied. Ten age classes were identified in the structure of the local populations of this invasive species, where virginal individuals accumulated an order of magnitude less dry phytomass than generative ones. Despite the low relative growth rate (of up to 0.05 g/g dry mass per day), the plants maintained high productivity. Light availability within the local populations was the key factor regulating the relative growth rate. Shading and intraspecific competition limited growth, especially in young plants. Virginal plants showed maximum RGR in the second age class, when their leaves were located in the middle or upper canopy layers of the vegetation. The relative growth rate of generative individuals was 20–60 % higher than that of virginal ones. During ontogenesis (aging), the rate of phytomass accumulation in H. mantegazzianum decreased to 0.004 g/g DW per day.

From 1973 to 2026, a total of 66 species of harmful arthropods and 21 species of predatory and parasitic arthropods have been recorded in the greenhouses of the Donetsk Botanical Garden. This communication presents original and literature-based data on 16 species of holometabolous insects pests: 1 species of Coleoptera (Curculionidae), 7 species of Lepidoptera from the families Bedelliidae (1), Tortricidae (1), Choreutidae (1), Noctuidae (3), and Sphingidae (1), 2 species of Diptera from the families Drosophilidae (1) and Sciaridae (1), and 6 species of ants (Hymenoptera: Formicidae). Of the recorded species, 6 are considered alien invasive. The alien invasive ant Hypoponera punctatissima (Roger, 1859) is recorded from the Donbass for the first time. In contrast to insects with incomplete metamorphosis and phytoparasitic mites, holometabolous insects in the greenhouses of the Donetsk Botanical Garden pose considerably less of a threat to plants. Helicoverpa armigera and Choreutis nemorana can be regarded as relatively harmful species.