Variety of plant pathogens of ornamental shrubs of the genus Rosa L.

In different phytogeographical subzones of Ukraine’s forest-steppe, variety of plant pathogens of the genus <i>Rosa</i> L. ornamental shrubs is represented by 15 species of 10 genera, 9 families, 7 orders of magnitude, 3 departments. The leading position is taken by the <i>Ascomycota</i> division, which is represented by 12 species (80% of the total amount), 8 genera (80%), 7 families (78%), and 5 orders (72%). <i>Oomycota</i> and <i>Basidiomycota</i> departments are represented with 1 and 2 species respectively. In the Ukraine’s forest-steppe environment, over the years of research, the most common disease among different representatives of the genus <i>Rosa</i> L. is <i>Diplocarpon rosae</i> FA Wolf, about 52.7%. Diseases caused by <i>Sphaerotheca pannosa</i> var. <i>rosae</i> Woron account for 28.3%: <i>Coniothyrium wernsdorffiae</i> Laubert―19.2%; <i>Botrytis cinerea</i> Pers.―16.9%; <i>Phragmidium mucronatum</i> (Pers.) Schltdl., <i>Phragmidium tuberculatum</i> Müll. Hal., <i>Nectria cinnabarina</i> (Tode) Fr.―from 7.2 to 6.7%. Pathogens <i>Alternaria alternata (Fr.) Keissl., <i>Alternaria tenuissima</i> (Kunze) Wiltshire, <i>Fusarium oxysporum</i> Schltdl., <i>Fusarium solani</i> (Mart.) Sacc., <i>Phytophthora cactorum</i> J. Schröt., <i>Verticillium dahliae</i> Kleb., <i>Verticillium albo-atrum</i> Reinke Berthold are less common―5%