Analysis of changes in the health conditions of memorial woody plants of the museum-reserve "Monrepos Park"
N 2011-2013 phytopathologic health conditions of deciduous trees in the memorial Monrepos Park (Vyborg, Leningrad Region, Russia) was re-examined to analyze changes in the prevalence of the most common tree diseases and their pathogens in the historic park over a period of 1991-2011. A comparison of the data on distribution of memorial trees by categories of condition showed decline in trees’ biological resistance over the study period. The most common and harmful pathogens such as canker-cancerous and rot diseases were identified. Uneven and often sharp rise ofpathogens abundance at different sections of the park, their patchy distribution, expansion of their substrate specialization as well as increase in the species composition of plant pathogens were observed. It is suggested that the disturbance of soil hydrological regime of the Monrepos Park has the leading role in the qualitative and quantitive changes in composition of pathogens and reduction of biological sustainability of memorial deciduous trees.