Przydatność pułapek roślinnych i pożywki ziemniaczano− −glukozowej do izolacji Phytophthora alni z porażonych tkanek olszy oraz z gleby

The purpose of the study was to determine the usefulness of green apples as well as leaves of rhododendron as trapping methods for isolation of Phytophthora alni in disease tissues and in the soil. Apple traps as well as rhododendron leaves may be used successfully for isolation of the pathogen from roots, stem collar and from the soil, respectively. Such baits are particularly recommended for pathogen isolation from mature trees what is usually more difficult than in the case of seedlings. Apart of P. alni, faster growing of Fusarium, Botrytis, Cladosporium, Chaetomium and Trichoderma species on PDA medium were also isolated from the base of stems of diseased alders. It could be also the reason why P. alni was not always isolated from diseased tissues.