Abstract
The article determines the species composition of causative agents of plant leaf diseases of the genus Alnus Mill. for the Siberian region, that grow in the arboretum collections and urbanized environment. The author has identified four phytopathogens, their spread and harmfulness are specified; established the confinement of foliar fungal pathogens to the host plant species, its ontogeny phase, and abiotic environmental factors. It had been found a hyperparasite Ramularia uredinis (W. Voss) Sacc. on a causative agent of alder rust (Melampsoridium alni (Thum.) Dietel), for which this phytopathogen is a new host.
Highlights
The genus Alnus Mill. includes about 30 species, most of them are spread in the Northern Hemisphere
Long-term monitoring of leaf diseases of the genus Alnus plants has demonstrated that a limited range of phytopathogens develops on them under Siberian compared with other regions
The first information on finding M. alni in Russia dated back 2005 [3], the earliest records of this fungus were made in Canada and the United States in 1985, where it was found on Alnus rubra and A. sinuate [4]
Summary
The genus Alnus Mill. includes about 30 species, most of them are spread in the Northern Hemisphere. Species of the genus Alnus are polymorphic and have a large number of decorative varieties, which makes them promising as landscaping objects in Siberian cities and towns. In this regard, it is necessary to study the pathogenic mycobiota capable to affect the resistance and decorativeness of alder species in culture. It is necessary to study the pathogenic mycobiota capable to affect the resistance and decorativeness of alder species in culture This is especially true for leaf pathogens. Due to the wide prevalence of a number of alder species and their different coenotic confinement, the study of concomitant mycobiota within the range taking into account various environmental factors is interesting, undoubtedly. As for other Alnus species, their number varies from 0 to 13 (Fig. 1)
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