Фітосанітарний стан Acer tataricum L. в урбоценозах правобережної частини м. Дніпра

Abstract

The research results of the vital state of Acer tataricum L. trees in the green areas of an industrial city in the period 2019–2021 are presented. In the city of Dnipro, Tatar maple grows in small groups or in a row planting in separate localities (stow, island, central park, residential and school area). A total of 112 A. tataricum trees were examined. The vital condition of most of them (75.0 %) was assessed as acceptable. The average parameters of the trees are as follows: plant height – 6 m, age – 28 years, trunk diameter – 10.2 cm. The best average indicators of the length of the annual growth have the trees of A. tataricum from the Lazar Globa Park – 5.8 mm, and «Tunelna Balka» stow – 5.7 mm. The diameter of the annual increase does not change reliably and is 2.3 mm on average for all researched trees. Examination of the leaves of A. tataricum to analyze the distribution, level of harmfulness and establish the phyllophages species composition and leaf diseases was carried out once a decade. A total of 3042 leaves were collected. The overall level of leaf damage by phyllophages was 48.6 %. The most damaged leaves were from trees growing in the central park (74.5 %) and the «Tunelna Balka» stow (65.4 %), the least – on Monastyrskyi Island (26.5 %). Among the types of damage, the main ones were: change in color of leaves due to feeding by sucking insects (50.5 % of all damaged leaves), leaves gnawing by chewing insects with an open lifestyle (40.3 %); leaf mining in 0.4 % of cases, gall-formation – in 0.5 %, respectively. During the research period, only two leaf diseases were detected. The specific disease of the Tatar maple, induced by the fungus Taphrina polyspora (Sorokīn) Johanson, 1886, affects plants in all experimental plots, in some cases the level of damage not only to the leaves, but also to the A. tataricum fruits of reached 100 % (Pokrovsky residential area, Monastyrskyi Island). Maple powdery mildew was detected only on the leaves of A. tataricum in a row planting on the school territory. It was established that the complex of insects – phyllophagous and anthophagous of Tatar maple, which grows in the green areas of the Dnipro right-bank, includes 28 species from 23 genera 15 families 5 orders. The share of Hemiptera is 42.8 %, Lepidoptera – 28.6 %, Coleoptera – 21.4 %, Thysanoptera and Diptera – 3.6 % each.