Distribution of Viscum album L. in Bryansk Oblast
摘要
The distribution of Viscum album L. in Bryansk oblast has been studied. The assessment of distribution is performed on a grid basis. In the 20th century, mistletoe was noted in 8 cells, and now the species has been registered in 95 cells out of 378 squares of grid mapping. Recently, the species range in the region has significantly expanded in the northeastern direction. Most often, mistletoe is noted in the central, southern, and southeastern regions of Bryansk oblast; the species has not been found in the southwestern regions on the border with Belarus in the 21st century. There have been no finds north of Bryansk in the region. In Bryansk oblast, mistletoe has been noted on 29 species of woody plants; in natural habitats it is most often recorded on Betula pendula. Within the boundaries of populated areas, V. album is most often found on Betula pendula, Sorbus aucuparia, Acer platanoides, Populus tremula, Pyrus communis, Prunus domestica, and Malus domestica. V. album has been occasionally found on Pinus sylvestris and Picea abies. V. album attacks young plants with unformed bark and weakened old-growth trees with soft wood confined to forest belts along highways, river valleys, old manor parks, and urban plantings. In parkland, V. album is found mainly on isolated trees that are well lit by the sun. The main distributor of mistletoe in the region is Bombycilla garrulus. The features of V. album dispersal in a model settlement (village of Dobrun, Bryansk district) are considered, where the species has spread over the plantings of the entire village territory in 20 years. Pregenerative and young generative plants predominate in the studied population.