| Summary: | Straipsnis apie naują invazinį augalų patogeną Phytophtora ramorum. Phytophthora ramorum is the new invasive Algae like Oomycetes known since the last 10 years in the USA and Europe. In California the pathogen is causal agent of sudden oak death whereas in Europe as twig bight of ericaceous plants, rotting of Vibumum species and at least 30 others species including beech and red oak. In Poland P. ramorum was detected from Rhododendron, Calluna, Pieris and Photinia. Additionally P. citricola was isolatedfrom diseased Rhododendron stem parts and leaves whereas P. cactorum was found on rotted leaf blades of Photinia. Botrytis cinerea, Pestalotia sydowiana and Mucor spp. were also often isolated from diseased plant parts. Isolates obtained from those plants caused necrosis of leaf blades and tip shoot parts. There were no significant differences between pathogenicity of tested isolates toward 4 plant species. It indicates on one source of the pathogen. On all tested cultivars of Calluna and Calluna vulgaris development of necrosis was observed on tip parts of shoots. Both plant species and crowberry could be the potential source of P. ramorum in forests.
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