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Bacterial Dropsy of European White Birch (Betula pendula Roth.) in Zhytomyr Polesye of Ukraine

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M.V. Shvets

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UDС

630*581.2

DOI:

10.17238/issn0536-1036.2017.4.84

Abstract

European white birch (Betula pendula Roth.) in Zhytomyr Polesye of Ukraine forms highly productive both pure and mixed plantings with Scotch pine (Pinus sylvestris L.), oak (Quercus robur L.), and aspen (Populus tremulae L.). In recent years, we observe a massive drying of this valuable woody plant, associated with infectious, primarily bacterial, pathology. The paper presents the study results of bacterial dropsy - a dangerous infectious birch disease, caused by phytopathogenic bacterium Enterobacter nimipressuralis. The process of European white birch dying off after its infection with bacterial dropsy occurs as a result of detachment of the cover parts with the formation of necrosis with a width of 10...20 cm and a length of 1 m or more. The pathogenicity of the causative agent of dropsy is proved in an experiment at the indicator plants and European white birch (shoots and leaves of B. pendula are not sensitive to the pathogen). Bacterial dropsy infestation with the formation of persistent foci of desiccation occurs more intensively in the birch plantations of older age groups. Together with E. nimipressuralis, other types of bacteria are isolated from the lesions, as well as fungi, which are obviously concomitant myco- and microflora in the pathology of bacterial dropsy. We have made a reasoned assumption about the direct participation of Tremex fuscicornis in the dissemination of E. nimipressuralis. Depending on the physiological state, the population density of B. pendula in the region under study varies on average from 0.09 to 10.9 flying holes per 1 dm2. Healthy trees and plantings are characterized by a practically zero number of T. fuscicornis on trunks. We have distinguished the plants with more than 7 holes per 1 dm2 and with a birch-tree in a dying state as strongly weakened trees and plantations.

Authors

M.V. Shvets, Postgraduate Student

Affiliation

National University of Life and Environmental Sciences of Ukraine, ul. Geroev Oborony, 15, bl. 1, Kyiv, 03041, Ukraine; е-mail: marina_lis@ukr.net

Keywords

bacterial dropsy, phytopathogenic bacteria, Enterobacter nimipressuralis, symp-tomatology, pathogenesis, Tremex fuscicornis, Betula pendula Roth., birch plantation, phy-tosanitary condition.

For citation

Shvets M.V. Bacterial Dropsy of European White Birch (Betula pendula Roth.) in Zhytomyr Polesye of Ukraine. Lesnoy zhurnal [Forestry journal], 2017, no. 4, pp. 84–94. 10.17238/issn0536-1036.2017.4.84

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Bacterial Dropsy of European White Birch (Betula pendula Roth.) in Zhytomyr Polesye of Ukraine

 

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