ECOLOGICAL FEATURES OF WHITE MISTLETOE SPREADING ON THE TERRITORY OF RIVNE

Abstract

The area of green plantations and complexes in the city of Rivne covers 564,5 hectares, including the part of green plantation of total use which contains 149,6 hectares and the part of limited use 319,3 hectares.The city of Rivne lags behind Lutsk (with 28,8 m2 for a person) and Ivano-Frankivsk (with 47,9 m2 for a person) as for the area of green plantations and complexes and which suffer from semi-parasite, mycoses and entomovermins damage.The results of research of white mistletoe spreading features on the territory of the city of Rivne are introduced, its negative influence on trees species is defined, the estimation of the level of the trees damage is carried out. The species structure of the trees affected by the semi-parasite plant was ascertained, white mistletoe were defined.In our opinion, one of the factors that positively affects the expansion of the mistletoe range is the change in climatic conditions over the past century in the direction of warming, high man-made impact, dry urban air, which significantly weakens the resistance of street plants to pests, reduces their immunity.Thus, studies have shown that recently in the city there is a positive trend of white mistletoe, which is a semi-parasitic plant with a wide selectivity. Therefore, today an important task is to protect green areas and areas of the city from damage by white mistletoe, both to preserve species diversity and improve the environment.It was found that the highest susceptibility to damage among 16 species of trees, semi-parasitic plant white mistletoe is observed in black poplar (Populus nigra L.) – 43% of the total number of affected trees, linden (Tilia cordata Mill) – 17%, aspen tremula L. – 10%. Horse chestnut (Aesculus hippocostanum L.) – 0.3% and maple (Acer platanoides L.) – 0.1% were the most resistant to white mistletoe