EN
During the last 3 years new Phytophthora species were detected on diseased Chamaecyparis spp., Thuja spp., Microbiota decussata, Picea and Pinus species and cultivars. On Chamaecyparis, beside P. cinnamomi known in Poland since 1993, P. cambivora, P. citricola and P. cryptogea were isolated from diseased roots and stem base. On Thuja spp., beside P. citricola. P. cinnamomi and P. cryptogea were isolated mainly from diseased shoots. On M. decussata, P. citricola is the next important agent causing shoot rot. On Picea and Pinus spp. P. cactorum, P. citricola and P. citrophthora were isolated from diseased stem bases and roots. All Phytophthora species, used for inoculation of coniferous shoot parts caused necroses. On the top part of Chamaecyparis spp., Juniperus stricta and J. virginiana ring spot disease incited by Pestalotiopsis sp. was observed during the last 2 years.