The condition of <i>Quercus robur</i> L. trees growing in various ecotopes of the city of Donetsk

The paper considers the issues of sustainability of oak stands in the changing climate of Donbass. It was found that the general condition of Quercus robur L. was assessed on the territory of the arboretum of the Donetsk Botanical Garden (experimental oak forests) as unsatisfactory, with serious violations in the structure of dendrocoenosis, which can lead to degradation of the ecotope. For the rest of the territories, the condition of the pedunculate oak trees is assessed as good. Plants show high resistance to anthropogenic loads, including pyramid-shaped trees. The fluctuating asymmetry of leaf plates as an indicator of plant resistance correlates with the condition of woody plants, and there are also prerequisites for the assertion that with the degree of damage to the leaf apparatus by dendrophilous insects. In turn, pests affect the stability of the development of the pedunculate oak in various ecotopes of the city of Donetsk. It was found that the characteristic damage of the oak broad-spreading moth Acrocercops brongniardella (Fabricius, 1798) leads to a decrease in the useful area of the leaf, which affects the deterioration of photosynthetic activity and photochemical efficiency (quantum yield of fluorescence). It was found that the level of minimum fluorescence for leaf plates without pest damage is on average 20,5% higher and reflects the amount of chlorophyll in the vegetative organ.