Incidence and pathogenicity of Phytophthora species in beech (Fagus sylvatica L.) stands in Slovakia

Abstract The common beech ( Fagus sylvatica L.) is the main forest-forming species in Slovakia and its share accounts for over 31% of total forest area this country. Recently, there are more reports deterioration health Europe, incl. as a result action pathogens genus Phytophthora . aim study to confirm presence forests Slovakia. Ten plots central western were selected study. of: P. x cambivora , cactorum plurivora Globisporangium macrosporum G. heterothallicum was confirmed samples taken. A pathogenicity test performed Koch’s postulates. After three months, plants gently taken out, then: pathogen reisolated from roots tissues, root systems scanned image analyzed with WinRhizo software, finally dried obtaining dry biomass. Additionally, during course experiment, degree infection assessed weekly order calculate under disease-progress curve. conducted research showed greatest threat In variant, symptoms plant dieback observed fastest, well pathogen, compared control significantly damaged systems.